[FIX] update sbt-idea to version 1.6.0
[FIX] update sbt-idea to version 1.6.0

I saw `No "scala-library*.jar" in Scala compiler library` error in IDEA. It seems upgrading `sbt-idea` to 1.6.0 fixed the problem.

Author: Xiangrui Meng <meng@databricks.com>

Closes #419 from mengxr/idea-plugin and squashes the following commits:

fb3c35f [Xiangrui Meng] update sbt-idea to version 1.6.0

joseph-torres/spark,akopich/spark,ibm-research-ireland/sparkoscope,sahilTakiar/spark,patrick-nicholson/spark,HyukjinKwon/spark,michalsenkyr/spark,mdespriee/spark,actuaryzhang/spark,setjet/spark,wangmiao1981/spark,SHASHANKB/spark,big-pegasus/spark,tejasapatil/spark,kimoonkim/spark,ptkool/spark,HyukjinKwon/spark,rikima/spark,ajaysaini725/spark,maropu/spark,sahilTakiar/spark,brad-kaiser/spark,saturday-shi/spark,mahak/spark,lxsmnv/spark,dbtsai/spark,jiangxb1987/spark,tejasapatil/spark,ron8hu/spark,debugger87/spark,actuaryzhang/spark,1haodian/spark,cloud-fan/spark,jianran/spark,michalsenkyr/spark,shuangshuangwang/spark,aray/spark,gioenn/xSpark,dbtsai/spark,caneGuy/spark,jlopezmalla/spark,huang1900/spark,srowen/spark,wangyum/spark,gengliangwang/spark,saltstar/spark,WeichenXu123/spark,aosagie/spark,publicRoman/spark,wangyum/spark,stanzhai/spark,saltstar/spark,ioana-delaney/spark,bravo-zhang/spark,patrick-nicholson/spark,actuaryzhang/spark,zero323/spark,zhouyejoe/spark,sahilTakiar/spark,mzl9039/spark,caneGuy/spark,rikima/spark,ConeyLiu/spark,nchammas/spark,JoshRosen/spark,gioenn/xSpark,nchammas/spark,panfengfeng/spark,liyichao/spark,JoshRosen/spark,hhbyyh/spark,bdrillard/spark,liyichao/spark,UndeadBaneGitHub/spark,jianran/spark,highfei2011/spark,ddna1021/spark,narahari92/spark,akopich/spark,zuotingbing/spark,poffuomo/spark,mzl9039/spark,haowu80s/spark,gengliangwang/spark,aokolnychyi/spark,spark-test/spark,1haodian/spark,publicRoman/spark,jkbradley/spark,adrian-ionescu/apache-spark,sachintyagi22/spark,pronix/spark,mdespriee/spark,rednaxelafx/apache-spark,pronix/spark,rikima/spark,dhruve/spark,pronix/spark,zuotingbing/spark,BryanCutler/spark,Aegeaner/spark,rezasafi/spark,rednaxelafx/apache-spark,nilsgrabbert/spark,xflin/spark,dbtsai/spark,MLnick/spark,guoxiaolongzte/spark,pgandhi999/spark,ptkool/spark,highfei2011/spark,dhruve/spark,akopich/spark,pronix/spark,someorz/spark,setjet/spark,shubhamchopra/spark,rekhajoshm/spark,ueshin/apache-spark,janewangfb/spark,jkbradley/spark,zhouyejoe/spark,saturday-shi/spark,map222/spark,szhem/spark,UndeadBaneGitHub/spark,tengpeng/spark,cin/spark,esi-mineset/spark,guoxiaolongzte/spark,patrick-nicholson/spark,holdenk/spark,dongjoon-hyun/spark,andrewor14/spark,andrewor14/iolap,haowu80s/spark,janewangfb/spark,haowu80s/spark,srowen/spark,shubhamchopra/spark,saltstar/spark,HyukjinKwon/spark,janewangfb/spark,rikima/spark,panfengfeng/spark,srowen/spark,michalsenkyr/spark,Panos-Bletsos/spark-cost-model-optimizer,shuangshuangwang/spark,kissmetrics/spark,metamx/spark,sahilTakiar/spark,kissmetrics/spark,narahari92/spark,shuangshuangwang/spark,ddna1021/spark,WeichenXu123/spark,kiszk/spark,wzhfy/spark,goldmedal/spark,lxsmnv/spark,WindCanDie/spark,cloud-fan/spark,aray/spark,tejasapatil/spark,mahak/spark,big-pegasus/spark,setjet/spark,mike0sv/spark,adrian-ionescu/apache-spark,spark-test/spark,maropu/spark,ahnqirage/spark,caneGuy/spark,ahnqirage/spark,mike0sv/spark,dongjoon-hyun/spark,apache/spark,sureshthalamati/spark,rekhajoshm/spark,srowen/spark,sureshthalamati/spark,maropu/spark,kimoonkim/spark,tengpeng/spark,szhem/spark,darionyaphet/spark,loneknightpy/spark,byakuinss/spark,saturday-shi/spark,bOOm-X/spark,darionyaphet/spark,mike0sv/spark,metamx/spark,bOOm-X/spark,dbtsai/spark,setjet/spark,aosagie/spark,darionyaphet/spark,milliman/spark,rezasafi/spark,metamx/spark,sahilTakiar/spark,SnappyDataInc/spark,ioana-delaney/spark,saturday-shi/spark,JerryLead/spark,lvdongr/spark,bdrillard/spark,nlalevee/spark,gioenn/xSpark,bOOm-X/spark,eyalfa/spark,zzcclp/spark,chuckchen/spark,janewangfb/spark,facaiy/spark,aosagie/spark,esi-mineset/spark,aray/spark,gioenn/xSpark,cloud-fan/spark,yanboliang/spark,adrian-ionescu/apache-spark,sahilTakiar/spark,panfengfeng/spark,rikima/spark,mahak/spark,markhamstra/spark,zero323/spark,stanzhai/spark,debugger87/spark,aosagie/spark,andrewor14/spark,ajaysaini725/spark,kevinyu98/spark,panfengfeng/spark,aray/spark,skonto/spark,holdenk/spark,shaneknapp/spark,UndeadBaneGitHub/spark,sachintyagi22/spark,liyichao/spark,andrewor14/spark,xuanyuanking/spark,vinodkc/spark,xuanyuanking/spark,minixalpha/spark,mike0sv/spark,taroplus/spark,jianran/spark,xuanyuanking/spark,zhouyejoe/spark,hvanhovell/spark,dbtsai/spark,ericvandenbergfb/spark,mdespriee/spark,saltstar/spark,SnappyDataInc/spark,mike0sv/spark,WindCanDie/spark,UndeadBaneGitHub/spark,highfei2011/spark,chuckchen/spark,rekhajoshm/spark,MLnick/spark,LantaoJin/spark,mzl9039/spark,alunarbeach/spark,kevinyu98/spark,esi-mineset/spark,stanzhai/spark,haowu80s/spark,cin/spark,setjet/spark,Aegeaner/spark,skonto/spark,rikima/spark,nilsgrabbert/spark,apache-spark-on-k8s/spark,szhem/spark,chuckchen/spark,huang1900/spark,ConeyLiu/spark,kevinyu98/spark,mdespriee/spark,shubhamchopra/spark,facaiy/spark,byakuinss/spark,SHASHANKB/spark,cin/spark,MLnick/spark,andrewor14/iolap,jkbradley/spark,icexelloss/spark,spark-test/spark,ahnqirage/spark,spark-test/spark,taroplus/spark,xflin/spark,WeichenXu123/spark,jkbradley/spark,WeichenXu123/spark,kissmetrics/spark,chuckchen/spark,bOOm-X/spark,techaddict/spark,rednaxelafx/apache-spark,LantaoJin/spark,witgo/spark,patrick-nicholson/spark,kissmetrics/spark,darionyaphet/spark,liutang123/spark,ConeyLiu/spark,nchammas/spark,taroplus/spark,apache-spark-on-k8s/spark,JerryLead/spark,bravo-zhang/spark,HyukjinKwon/spark,poffuomo/spark,esi-mineset/spark,joseph-torres/spark,Panos-Bletsos/spark-cost-model-optimizer,saltstar/spark,lvdongr/spark,brad-kaiser/spark,maropu/spark,mahak/spark,WeichenXu123/spark,goldmedal/spark,rekhajoshm/spark,ioana-delaney/spark,loneknightpy/spark,nilsgrabbert/spark,poffuomo/spark,zuotingbing/spark,andrewor14/iolap,witgo/spark,facaiy/spark,cin/spark,zero323/spark,apache/spark,guoxiaolongzte/spark,srowen/spark,brad-kaiser/spark,rezasafi/spark,facaiy/spark,caneGuy/spark,guoxiaolongzte/spark,tejasapatil/spark,andrewor14/iolap,xflin/spark,vinodkc/spark,pgandhi999/spark,shuangshuangwang/spark,bdrillard/spark,liyichao/spark,SnappyDataInc/spark,1haodian/spark,rezasafi/spark,tejasapatil/spark,shaneknapp/spark,joseph-torres/spark,ioana-delaney/spark,kissmetrics/spark,hhbyyh/spark,metamx/spark,holdenk/spark,jiangxb1987/spark,alunarbeach/spark,nchammas/spark,apache/spark,huang1900/spark,haowu80s/spark,ron8hu/spark,pgandhi999/spark,rekhajoshm/spark,yanboliang/spark,adrian-ionescu/apache-spark,wangyum/spark,actuaryzhang/spark,chuckchen/spark,loneknightpy/spark,byakuinss/spark,WindCanDie/spark,dbtsai/spark,kimoonkim/spark,nilsgrabbert/spark,ajaysaini725/spark,map222/spark,ericvandenbergfb/spark,eyalfa/spark,wzhfy/spark,poffuomo/spark,bdrillard/spark,zero323/spark,markhamstra/spark,srowen/spark,aokolnychyi/spark,hhbyyh/spark,someorz/spark,panfengfeng/spark,huang1900/spark,dbtsai/spark,ron8hu/spark,wangmiao1981/spark,mahak/spark,kissmetrics/spark,andrewor14/spark,techaddict/spark,shaneknapp/spark,ibm-research-ireland/sparkoscope,dongjoon-hyun/spark,big-pegasus/spark,loneknightpy/spark,map222/spark,JoshRosen/spark,wangyum/spark,alunarbeach/spark,ddna1021/spark,kiszk/spark,LantaoJin/spark,highfei2011/spark,maropu/spark,bravo-zhang/spark,esi-mineset/spark,Aegeaner/spark,yanboliang/spark,wangmiao1981/spark,cin/spark,hhbyyh/spark,jlopezmalla/spark,BryanCutler/spark,ptkool/spark,icexelloss/spark,zuotingbing/spark,skonto/spark,wangmiao1981/spark,lxsmnv/spark,andrewor14/spark,spark-test/spark,goldmedal/spark,Panos-Bletsos/spark-cost-model-optimizer,aokolnychyi/spark,ericvandenbergfb/spark,sachintyagi22/spark,kiszk/spark,jlopezmalla/spark,jlopezmalla/spark,milliman/spark,wzhfy/spark,Panos-Bletsos/spark-cost-model-optimizer,xflin/spark,mdespriee/spark,rednaxelafx/apache-spark,1haodian/spark,someorz/spark,ron8hu/spark,ueshin/apache-spark,icexelloss/spark,bdrillard/spark,SHASHANKB/spark,WeichenXu123/spark,jianran/spark,gengliangwang/spark,jlopezmalla/spark,holdenk/spark,markhamstra/spark,JoshRosen/spark,aosagie/spark,stanzhai/spark,gioenn/xSpark,WindCanDie/spark,joseph-torres/spark,ioana-delaney/spark,SHASHANKB/spark,jkbradley/spark,JoshRosen/spark,sachintyagi22/spark,janewangfb/spark,ueshin/apache-spark,holdenk/spark,esi-mineset/spark,saltstar/spark,hvanhovell/spark,ibm-research-ireland/sparkoscope,zuotingbing/spark,WindCanDie/spark,ioana-delaney/spark,UndeadBaneGitHub/spark,WindCanDie/spark,milliman/spark,dhruve/spark,mike0sv/spark,huang1900/spark,caneGuy/spark,yanboliang/spark,hvanhovell/spark,SHASHANKB/spark,saturday-shi/spark,wangmiao1981/spark,jrshust/spark,wangmiao1981/spark,LantaoJin/spark,zuotingbing/spark,kimoonkim/spark,akopich/spark,nlalevee/spark,andrewor14/iolap,HyukjinKwon/spark,pgandhi999/spark,poffuomo/spark,actuaryzhang/spark,wzhfy/spark,eyalfa/spark,big-pegasus/spark,szhem/spark,guoxiaolongzte/spark,someorz/spark,debugger87/spark,ibm-research-ireland/sparkoscope,Aegeaner/spark,darionyaphet/spark,eyalfa/spark,ueshin/apache-spark,aokolnychyi/spark,shubhamchopra/spark,jianran/spark,big-pegasus/spark,zzcclp/spark,dhruve/spark,WeichenXu123/spark,tengpeng/spark,shuangshuangwang/spark,xuanyuanking/spark,liutang123/spark,ahnqirage/spark,bravo-zhang/spark,ptkool/spark,sureshthalamati/spark,highfei2011/spark,ahnqirage/spark,taroplus/spark,milliman/spark,saltstar/spark,witgo/spark,WindCanDie/spark,liyichao/spark,rekhajoshm/spark,kimoonkim/spark,spark-test/spark,gengliangwang/spark,michalsenkyr/spark,guoxiaolongzte/spark,map222/spark,metamx/spark,mdespriee/spark,actuaryzhang/spark,apache-spark-on-k8s/spark,BryanCutler/spark,ericvandenbergfb/spark,pgandhi999/spark,bdrillard/spark,SnappyDataInc/spark,ueshin/apache-spark,joseph-torres/spark,andrewor14/spark,aokolnychyi/spark,mdespriee/spark,pronix/spark,tengpeng/spark,skonto/spark,nlalevee/spark,andrewor14/spark,ConeyLiu/spark,goldmedal/spark,kevinyu98/spark,Panos-Bletsos/spark-cost-model-optimizer,huang1900/spark,ibm-research-ireland/sparkoscope,wangmiao1981/spark,sureshthalamati/spark,map222/spark,apache-spark-on-k8s/spark,goldmedal/spark,someorz/spark,ibm-research-ireland/sparkoscope,publicRoman/spark,ptkool/spark,akopich/spark,pgandhi999/spark,ajaysaini725/spark,janewangfb/spark,zzcclp/spark,publicRoman/spark,lxsmnv/spark,matthewfranglen/spark,brad-kaiser/spark,ptkool/spark,michalsenkyr/spark,SnappyDataInc/spark,byakuinss/spark,esi-mineset/spark,narahari92/spark,wangyum/spark,JerryLead/spark,eyalfa/spark,lvdongr/spark,taroplus/spark,alunarbeach/spark,icexelloss/spark,aokolnychyi/spark,hhbyyh/spark,caneGuy/spark,ericvandenbergfb/spark,kevinyu98/spark,narahari92/spark,janewangfb/spark,markhamstra/spark,kiszk/spark,michalsenkyr/spark,markhamstra/spark,sureshthalamati/spark,dhruve/spark,minixalpha/spark,rekhajoshm/spark,brad-kaiser/spark,ajaysaini725/spark,LantaoJin/spark,JerryLead/spark,xflin/spark,nlalevee/spark,gengliangwang/spark,kiszk/spark,lvdongr/spark,1haodian/spark,zzcclp/spark,jkbradley/spark,ahnqirage/spark,byakuinss/spark,panfengfeng/spark,dhruve/spark,Panos-Bletsos/spark-cost-model-optimizer,ericvandenbergfb/spark,setjet/spark,SHASHANKB/spark,cin/spark,jlopezmalla/spark,witgo/spark,loneknightpy/spark,ConeyLiu/spark,cloud-fan/spark,jiangxb1987/spark,setjet/spark,BryanCutler/spark,ddna1021/spark,pronix/spark,witgo/spark,ptkool/spark,eyalfa/spark,hvanhovell/spark,akopich/spark,vinodkc/spark,jrshust/spark,ioana-delaney/spark,loneknightpy/spark,mzl9039/spark,skonto/spark,patrick-nicholson/spark,JerryLead/spark,bOOm-X/spark,minixalpha/spark,Aegeaner/spark,techaddict/spark,ericvandenbergfb/spark,brad-kaiser/spark,sachintyagi22/spark,techaddict/spark,liutang123/spark,minixalpha/spark,someorz/spark,joseph-torres/spark,loneknightpy/spark,techaddict/spark,icexelloss/spark,narahari92/spark,nlalevee/spark,ajaysaini725/spark,jiangxb1987/spark,ajaysaini725/spark,liutang123/spark,shubhamchopra/spark,yanboliang/spark,map222/spark,icexelloss/spark,liyichao/spark,metamx/spark,sureshthalamati/spark,sureshthalamati/spark,tengpeng/spark,aosagie/spark,dhruve/spark,bravo-zhang/spark,patrick-nicholson/spark,ddna1021/spark,ConeyLiu/spark,sachintyagi22/spark,debugger87/spark,BryanCutler/spark,szhem/spark,ron8hu/spark,ibm-research-ireland/sparkoscope,rezasafi/spark,LantaoJin/spark,wzhfy/spark,taroplus/spark,szhem/spark,gengliangwang/spark,BryanCutler/spark,jlopezmalla/spark,apache/spark,big-pegasus/spark,milliman/spark,goldmedal/spark,spark-test/spark,hvanhovell/spark,cloud-fan/spark,skonto/spark,shaneknapp/spark,milliman/spark,wzhfy/spark,maropu/spark,UndeadBaneGitHub/spark,highfei2011/spark,rednaxelafx/apache-spark,lvdongr/spark,apache/spark,ueshin/apache-spark,hhbyyh/spark,shuangshuangwang/spark,srowen/spark,zhouyejoe/spark,bOOm-X/spark,nchammas/spark,hhbyyh/spark,tengpeng/spark,1haodian/spark,lxsmnv/spark,kevinyu98/spark,vinodkc/spark,mahak/spark,kissmetrics/spark,bravo-zhang/spark,Panos-Bletsos/spark-cost-model-optimizer,holdenk/spark,MLnick/spark,techaddict/spark,nilsgrabbert/spark,yanboliang/spark,wzhfy/spark,map222/spark,LantaoJin/spark,hvanhovell/spark,vinodkc/spark,markhamstra/spark,MLnick/spark,nchammas/spark,alunarbeach/spark,gioenn/xSpark,dongjoon-hyun/spark,rezasafi/spark,facaiy/spark,ddna1021/spark,lvdongr/spark,rednaxelafx/apache-spark,HyukjinKwon/spark,jianran/spark,andrewor14/iolap,vinodkc/spark,liutang123/spark,saturday-shi/spark,jrshust/spark,poffuomo/spark,lvdongr/spark,apache-spark-on-k8s/spark,HyukjinKwon/spark,zhouyejoe/spark,MLnick/spark,aokolnychyi/spark,jiangxb1987/spark,guoxiaolongzte/spark,gengliangwang/spark,dongjoon-hyun/spark,adrian-ionescu/apache-spark,aray/spark,shuangshuangwang/spark,kimoonkim/spark,aray/spark,kevinyu98/spark,wangyum/spark,huang1900/spark,debugger87/spark,JoshRosen/spark,jrshust/spark,SHASHANKB/spark,publicRoman/spark,xuanyuanking/spark,SnappyDataInc/spark,tejasapatil/spark,metamx/spark,markhamstra/spark,witgo/spark,zzcclp/spark,pgandhi999/spark,byakuinss/spark,facaiy/spark,rednaxelafx/apache-spark,shaneknapp/spark,nchammas/spark,MLnick/spark,jrshust/spark,goldmedal/spark,aray/spark,minixalpha/spark,JerryLead/spark,nlalevee/spark,gioenn/xSpark,minixalpha/spark,apache/spark,darionyaphet/spark,szhem/spark,tejasapatil/spark,xflin/spark,saturday-shi/spark,jiangxb1987/spark,andrewor14/iolap,patrick-nicholson/spark,jianran/spark,lxsmnv/spark,zhouyejoe/spark,jkbradley/spark,mzl9039/spark,taroplus/spark,vinodkc/spark,stanzhai/spark,bravo-zhang/spark,BryanCutler/spark,aosagie/spark,zero323/spark,bdrillard/spark,zhouyejoe/spark,sachintyagi22/spark,JerryLead/spark,mzl9039/spark,jiangxb1987/spark,liutang123/spark,zzcclp/spark,ron8hu/spark,ueshin/apache-spark,dongjoon-hyun/spark,chuckchen/spark,rikima/spark,highfei2011/spark,haowu80s/spark,shaneknapp/spark,darionyaphet/spark,apache-spark-on-k8s/spark,tengpeng/spark,milliman/spark,eyalfa/spark,sahilTakiar/spark,SnappyDataInc/spark,actuaryzhang/spark,zero323/spark,Aegeaner/spark,nlalevee/spark,poffuomo/spark,publicRoman/spark,byakuinss/spark,debugger87/spark,liutang123/spark,jrshust/spark,xflin/spark,stanzhai/spark,UndeadBaneGitHub/spark,1haodian/spark,JoshRosen/spark,someorz/spark,kiszk/spark,cloud-fan/spark,big-pegasus/spark,mahak/spark,bOOm-X/spark,skonto/spark,icexelloss/spark,hvanhovell/spark,facaiy/spark,dongjoon-hyun/spark,apache/spark,jrshust/spark,techaddict/spark,shubhamchopra/spark,publicRoman/spark,rezasafi/spark,nilsgrabbert/spark,mike0sv/spark,debugger87/spark,lxsmnv/spark,alunarbeach/spark,stanzhai/spark,ahnqirage/spark,cloud-fan/spark,chuckchen/spark,maropu/spark,panfengfeng/spark,ConeyLiu/spark,adrian-ionescu/apache-spark,zuotingbing/spark,cin/spark,mzl9039/spark,akopich/spark,holdenk/spark,ddna1021/spark,liyichao/spark,witgo/spark,michalsenkyr/spark,yanboliang/spark,wangyum/spark,brad-kaiser/spark,caneGuy/spark,adrian-ionescu/apache-spark,nilsgrabbert/spark,shaneknapp/spark,zzcclp/spark,shubhamchopra/spark,narahari92/spark,minixalpha/spark,ron8hu/spark,xuanyuanking/spark,kimoonkim/spark,alunarbeach/spark,joseph-torres/spark,xuanyuanking/spark,narahari92/spark,apache-spark-on-k8s/spark,zero323/spark,kiszk/spark,Aegeaner/spark