Use absolute import in source_plugin.vim
Use absolute import in source_plugin.vim

Refs #95.

blindFS/powerline,dragon788/powerline,s0undt3ch/powerline,firebitsbr/powerline,prvnkumar/powerline,cyrixhero/powerline,magus424/powerline,S0lll0s/powerline,IvanAli/powerline,lukw00/powerline,kenrachynski/powerline,darac/powerline,prvnkumar/powerline,Luffin/powerline,EricSB/powerline,bartvm/powerline,dragon788/powerline,Luffin/powerline,IvanAli/powerline,seanfisk/powerline,S0lll0s/powerline,Liangjianghao/powerline,DoctorJellyface/powerline,xxxhycl2010/powerline,bezhermoso/powerline,QuLogic/powerline,xxxhycl2010/powerline,EricSB/powerline,magus424/powerline,kenrachynski/powerline,bezhermoso/powerline,magus424/powerline,russellb/powerline,areteix/powerline,cyrixhero/powerline,areteix/powerline,Luffin/powerline,bartvm/powerline,blindFS/powerline,cyrixhero/powerline,bartvm/powerline,prvnkumar/powerline,s0undt3ch/powerline,s0undt3ch/powerline,keelerm84/powerline,junix/powerline,firebitsbr/powerline,darac/powerline,dragon788/powerline,bezhermoso/powerline,xxxhycl2010/powerline,DoctorJellyface/powerline,firebitsbr/powerline,areteix/powerline,lukw00/powerline,keelerm84/powerline,junix/powerline,Liangjianghao/powerline,QuLogic/powerline,junix/powerline,kenrachynski/powerline,wfscheper/powerline,EricSB/powerline,xfumihiro/powerline,seanfisk/powerline,wfscheper/powerline,russellb/powerline,xfumihiro/powerline,xfumihiro/powerline,wfscheper/powerline,russellb/powerline,blindFS/powerline,QuLogic/powerline,seanfisk/powerline,darac/powerline,S0lll0s/powerline,IvanAli/powerline,lukw00/powerline,DoctorJellyface/powerline,Liangjianghao/powerline