provision.py: Check whether git repository is present.
provision.py: Check whether git repository is present.

Fixes #148.

blaze225/zulip,arpith/zulip,vaidap/zulip,ahmadassaf/zulip,Galexrt/zulip,jainayush975/zulip,Vallher/zulip,punchagan/zulip,ryanbackman/zulip,atomic-labs/zulip,ryansnowboarder/zulip,karamcnair/zulip,ashwinirudrappa/zulip,calvinleenyc/zulip,KingxBanana/zulip,zacps/zulip,punchagan/zulip,souravbadami/zulip,ahmadassaf/zulip,aakash-cr7/zulip,mohsenSy/zulip,ashwinirudrappa/zulip,susansls/zulip,vikas-parashar/zulip,sharmaeklavya2/zulip,esander91/zulip,punchagan/zulip,christi3k/zulip,SmartPeople/zulip,karamcnair/zulip,paxapy/zulip,Vallher/zulip,atomic-labs/zulip,vakila/zulip,kou/zulip,jainayush975/zulip,dhcrzf/zulip,niftynei/zulip,sup95/zulip,timabbott/zulip,gkotian/zulip,dattatreya303/zulip,vikas-parashar/zulip,ryansnowboarder/zulip,alliejones/zulip,brainwane/zulip,Diptanshu8/zulip,Frouk/zulip,jphilipsen05/zulip,shubhamdhama/zulip,punchagan/zulip,jackrzhang/zulip,rishig/zulip,verma-varsha/zulip,KingxBanana/zulip,ryanbackman/zulip,dattatreya303/zulip,reyha/zulip,showell/zulip,synicalsyntax/zulip,sharmaeklavya2/zulip,Juanvulcano/zulip,dhcrzf/zulip,andersk/zulip,PhilSk/zulip,Diptanshu8/zulip,jainayush975/zulip,amanharitsh123/zulip,Galexrt/zulip,krtkmj/zulip,gkotian/zulip,souravbadami/zulip,hackerkid/zulip,vakila/zulip,reyha/zulip,joyhchen/zulip,krtkmj/zulip,peguin40/zulip,amyliu345/zulip,ryansnowboarder/zulip,PhilSk/zulip,esander91/zulip,alliejones/zulip,rishig/zulip,vakila/zulip,zulip/zulip,dawran6/zulip,tommyip/zulip,krtkmj/zulip,andersk/zulip,karamcnair/zulip,brainwane/zulip,sharmaeklavya2/zulip,vikas-parashar/zulip,Frouk/zulip,zacps/zulip,umkay/zulip,aakash-cr7/zulip,JPJPJPOPOP/zulip,TigorC/zulip,j831/zulip,samatdav/zulip,hackerkid/zulip,christi3k/zulip,umkay/zulip,mahim97/zulip,karamcnair/zulip,sup95/zulip,dwrpayne/zulip,hackerkid/zulip,peiwei/zulip,gkotian/zulip,tommyip/zulip,jackrzhang/zulip,j831/zulip,showell/zulip,samatdav/zulip,isht3/zulip,jainayush975/zulip,atomic-labs/zulip,peguin40/zulip,AZtheAsian/zulip,dhcrzf/zulip,vabs22/zulip,sonali0901/zulip,joyhchen/zulip,TigorC/zulip,sharmaeklavya2/zulip,vikas-parashar/zulip,vakila/zulip,isht3/zulip,synicalsyntax/zulip,timabbott/zulip,PhilSk/zulip,sup95/zulip,paxapy/zulip,jphilipsen05/zulip,sharmaeklavya2/zulip,ryanbackman/zulip,zacps/zulip,Frouk/zulip,kou/zulip,kou/zulip,verma-varsha/zulip,arpith/zulip,tommyip/zulip,sonali0901/zulip,zulip/zulip,peiwei/zulip,Jianchun1/zulip,sup95/zulip,christi3k/zulip,samatdav/zulip,rht/zulip,rht/zulip,amyliu345/zulip,ryansnowboarder/zulip,dawran6/zulip,isht3/zulip,tommyip/zulip,andersk/zulip,Juanvulcano/zulip,Jianchun1/zulip,andersk/zulip,synicalsyntax/zulip,sonali0901/zulip,zacps/zulip,Galexrt/zulip,SmartPeople/zulip,Juanvulcano/zulip,KingxBanana/zulip,dattatreya303/zulip,blaze225/zulip,timabbott/zulip,amyliu345/zulip,ahmadassaf/zulip,eeshangarg/zulip,ashwinirudrappa/zulip,souravbadami/zulip,Juanvulcano/zulip,arpith/zulip,zulip/zulip,Jianchun1/zulip,verma-varsha/zulip,jphilipsen05/zulip,grave-w-grave/zulip,esander91/zulip,amanharitsh123/zulip,ashwinirudrappa/zulip,punchagan/zulip,amanharitsh123/zulip,timabbott/zulip,shubhamdhama/zulip,vabs22/zulip,cosmicAsymmetry/zulip,tommyip/zulip,calvinleenyc/zulip,calvinleenyc/zulip,blaze225/zulip,ryansnowboarder/zulip,souravbadami/zulip,ryanbackman/zulip,showell/zulip,peguin40/zulip,mohsenSy/zulip,vabs22/zulip,SmartPeople/zulip,esander91/zulip,karamcnair/zulip,jrowan/zulip,paxapy/zulip,dattatreya303/zulip,umkay/zulip,Diptanshu8/zulip,alliejones/zulip,ryansnowboarder/zulip,atomic-labs/zulip,paxapy/zulip,calvinleenyc/zulip,rht/zulip,jainayush975/zulip,cosmicAsymmetry/zulip,gkotian/zulip,jainayush975/zulip,synicalsyntax/zulip,cosmicAsymmetry/zulip,Diptanshu8/zulip,showell/zulip,Galexrt/zulip,SmartPeople/zulip,atomic-labs/zulip,Vallher/zulip,blaze225/zulip,umkay/zulip,zacps/zulip,rishig/zulip,grave-w-grave/zulip,gkotian/zulip,KingxBanana/zulip,atomic-labs/zulip,j831/zulip,JPJPJPOPOP/zulip,blaze225/zulip,TigorC/zulip,ahmadassaf/zulip,dawran6/zulip,ahmadassaf/zulip,vaidap/zulip,grave-w-grave/zulip,brockwhittaker/zulip,rishig/zulip,dwrpayne/zulip,karamcnair/zulip,vakila/zulip,umkay/zulip,vakila/zulip,peiwei/zulip,vabs22/zulip,brainwane/zulip,eeshangarg/zulip,gkotian/zulip,niftynei/zulip,rht/zulip,vaidap/zulip,reyha/zulip,jrowan/zulip,reyha/zulip,PhilSk/zulip,JPJPJPOPOP/zulip,kou/zulip,souravbadami/zulip,eeshangarg/zulip,alliejones/zulip,verma-varsha/zulip,KingxBanana/zulip,grave-w-grave/zulip,eeshangarg/zulip,peiwei/zulip,Jianchun1/zulip,vakila/zulip,joyhchen/zulip,niftynei/zulip,rishig/zulip,mohsenSy/zulip,PhilSk/zulip,amyliu345/zulip,andersk/zulip,Frouk/zulip,sonali0901/zulip,rishig/zulip,joyhchen/zulip,susansls/zulip,JPJPJPOPOP/zulip,jphilipsen05/zulip,amyliu345/zulip,paxapy/zulip,JPJPJPOPOP/zulip,andersk/zulip,synicalsyntax/zulip,alliejones/zulip,brockwhittaker/zulip,samatdav/zulip,ryanbackman/zulip,Diptanshu8/zulip,Galexrt/zulip,peiwei/zulip,isht3/zulip,verma-varsha/zulip,grave-w-grave/zulip,PhilSk/zulip,ryanbackman/zulip,vabs22/zulip,dattatreya303/zulip,esander91/zulip,brockwhittaker/zulip,eeshangarg/zulip,amanharitsh123/zulip,hackerkid/zulip,cosmicAsymmetry/zulip,shubhamdhama/zulip,mahim97/zulip,Vallher/zulip,arpith/zulip,TigorC/zulip,Frouk/zulip,shubhamdhama/zulip,rht/zulip,AZtheAsian/zulip,dhcrzf/zulip,Juanvulcano/zulip,Jianchun1/zulip,TigorC/zulip,vaidap/zulip,kou/zulip,ashwinirudrappa/zulip,jackrzhang/zulip,mahim97/zulip,punchagan/zulip,alliejones/zulip,showell/zulip,brockwhittaker/zulip,souravbadami/zulip,dawran6/zulip,jphilipsen05/zulip,verma-varsha/zulip,joyhchen/zulip,ahmadassaf/zulip,sonali0901/zulip,peguin40/zulip,brockwhittaker/zulip,dawran6/zulip,timabbott/zulip,jackrzhang/zulip,vaidap/zulip,AZtheAsian/zulip,paxapy/zulip,shubhamdhama/zulip,eeshangarg/zulip,mohsenSy/zulip,arpith/zulip,Diptanshu8/zulip,shubhamdhama/zulip,zulip/zulip,grave-w-grave/zulip,synicalsyntax/zulip,j831/zulip,blaze225/zulip,sup95/zulip,jrowan/zulip,brockwhittaker/zulip,Vallher/zulip,joyhchen/zulip,zulip/zulip,peguin40/zulip,vikas-parashar/zulip,peguin40/zulip,calvinleenyc/zulip,karamcnair/zulip,susansls/zulip,dwrpayne/zulip,Frouk/zulip,vaidap/zulip,dhcrzf/zulip,mahim97/zulip,christi3k/zulip,atomic-labs/zulip,andersk/zulip,zacps/zulip,mohsenSy/zulip,jrowan/zulip,niftynei/zulip,susansls/zulip,hackerkid/zulip,umkay/zulip,vikas-parashar/zulip,JPJPJPOPOP/zulip,brainwane/zulip,dwrpayne/zulip,j831/zulip,ryansnowboarder/zulip,Jianchun1/zulip,alliejones/zulip,hackerkid/zulip,Galexrt/zulip,sharmaeklavya2/zulip,jphilipsen05/zulip,susansls/zulip,niftynei/zulip,Juanvulcano/zulip,showell/zulip,jrowan/zulip,eeshangarg/zulip,peiwei/zulip,kou/zulip,gkotian/zulip,cosmicAsymmetry/zulip,kou/zulip,SmartPeople/zulip,TigorC/zulip,peiwei/zulip,dwrpayne/zulip,reyha/zulip,esander91/zulip,esander91/zulip,umkay/zulip,calvinleenyc/zulip,jackrzhang/zulip,mahim97/zulip,ashwinirudrappa/zulip,synicalsyntax/zulip,amyliu345/zulip,ahmadassaf/zulip,AZtheAsian/zulip,samatdav/zulip,amanharitsh123/zulip,susansls/zulip,christi3k/zulip,dwrpayne/zulip,timabbott/zulip,reyha/zulip,cosmicAsymmetry/zulip,brainwane/zulip,aakash-cr7/zulip,brainwane/zulip,ashwinirudrappa/zulip,sonali0901/zulip,AZtheAsian/zulip,krtkmj/zulip,hackerkid/zulip,krtkmj/zulip,isht3/zulip,timabbott/zulip,showell/zulip,shubhamdhama/zulip,aakash-cr7/zulip,rht/zulip,KingxBanana/zulip,mahim97/zulip,sup95/zulip,tommyip/zulip,mohsenSy/zulip,krtkmj/zulip,christi3k/zulip,samatdav/zulip,arpith/zulip,punchagan/zulip,vabs22/zulip,tommyip/zulip,SmartPeople/zulip,krtkmj/zulip,dhcrzf/zulip,brainwane/zulip,dwrpayne/zulip,aakash-cr7/zulip,rishig/zulip,Galexrt/zulip,amanharitsh123/zulip,dhcrzf/zulip,zulip/zulip,niftynei/zulip,aakash-cr7/zulip,jrowan/zulip,Vallher/zulip,dattatreya303/zulip,Vallher/zulip,jackrzhang/zulip,AZtheAsian/zulip,isht3/zulip,rht/zulip,j831/zulip,dawran6/zulip,zulip/zulip,jackrzhang/zulip,Frouk/zulip