Add troubleshooting info for Windows gVim + git users
Add troubleshooting info for Windows gVim + git users

Closes #36.

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