SPARK-1173. Improve scala streaming docs.
SPARK-1173. Improve scala streaming docs.

Clarify imports to add implicit conversions to DStream and
fix other small typos in the streaming intro documentation.

Tested by inspecting output via a local jekyll server, c&p'ing the scala commands into a spark terminal.

Author: Aaron Kimball <aaron@magnify.io>

Closes #64 from kimballa/spark-1173-streaming-docs and squashes the following commits:

6fbff0e [Aaron Kimball] SPARK-1173. Improve scala streaming docs.

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