Added specs for Repository#exists?
Added specs for Repository#exists?

dplarson/gitlabhq,shinexiao/gitlabhq,axilleas/gitlabhq,Soullivaneuh/gitlabhq,jirutka/gitlabhq,screenpages/gitlabhq,darkrasid/gitlabhq,axilleas/gitlabhq,iiet/iiet-git,SVArago/gitlabhq,iiet/iiet-git,larryli/gitlabhq,ttasanen/gitlabhq,daiyu/gitlab-zh,shinexiao/gitlabhq,allysonbarros/gitlabhq,allysonbarros/gitlabhq,htve/GitlabForChinese,dwrensha/gitlabhq,mr-dxdy/gitlabhq,allysonbarros/gitlabhq,larryli/gitlabhq,screenpages/gitlabhq,htve/GitlabForChinese,icedwater/gitlabhq,ttasanen/gitlabhq,shinexiao/gitlabhq,dreampet/gitlab,larryli/gitlabhq,dplarson/gitlabhq,dreampet/gitlab,shinexiao/gitlabhq,LUMC/gitlabhq,jirutka/gitlabhq,dreampet/gitlab,ttasanen/gitlabhq,mmkassem/gitlabhq,dreampet/gitlab,dplarson/gitlabhq,openwide-java/gitlabhq,jirutka/gitlabhq,SVArago/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,larryli/gitlabhq,htve/GitlabForChinese,Soullivaneuh/gitlabhq,LUMC/gitlabhq,t-zuehlsdorff/gitlabhq,LUMC/gitlabhq,htve/GitlabForChinese,dwrensha/gitlabhq,jirutka/gitlabhq,Soullivaneuh/gitlabhq,martijnvermaat/gitlabhq,mr-dxdy/gitlabhq,iiet/iiet-git,screenpages/gitlabhq,stoplightio/gitlabhq,LUMC/gitlabhq,t-zuehlsdorff/gitlabhq,allysonbarros/gitlabhq,daiyu/gitlab-zh,axilleas/gitlabhq,openwide-java/gitlabhq,icedwater/gitlabhq,mr-dxdy/gitlabhq,ttasanen/gitlabhq,martijnvermaat/gitlabhq,darkrasid/gitlabhq,screenpages/gitlabhq,openwide-java/gitlabhq,daiyu/gitlab-zh,dwrensha/gitlabhq,openwide-java/gitlabhq,mmkassem/gitlabhq,icedwater/gitlabhq,dplarson/gitlabhq,axilleas/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,darkrasid/gitlabhq,t-zuehlsdorff/gitlabhq,t-zuehlsdorff/gitlabhq,iiet/iiet-git,Soullivaneuh/gitlabhq,SVArago/gitlabhq,martijnvermaat/gitlabhq,martijnvermaat/gitlabhq,stoplightio/gitlabhq,dwrensha/gitlabhq,icedwater/gitlabhq,darkrasid/gitlabhq,mr-dxdy/gitlabhq,daiyu/gitlab-zh,SVArago/gitlabhq