Fix a bug in commenting on a merge request
Fix a bug in commenting on a merge request

When commenting on a merge request with context "eg. a set of lines", we
need to set Comment#context. This commit exposes that property so
commenting on a range of lines in a MR diff works again.

elcom/gitorious,elcom/gitorious,elcom/gitorious,SamuelMoraesF/Gitorious,SamuelMoraesF/Gitorious,tigefa4u/gitorious-mainline,tigefa4u/gitorious-mainline,spencerwp/mainline,gitorious/mainline,gitorious/mainline,tigefa4u/gitorious-mainline,SamuelMoraesF/Gitorious,spencerwp/mainline,Gitorious-backup/mainline,spencerwp/mainline,gitorious/mainline,Gitorious-backup/mainline,rae/gitorious-mainline,spencerwp/mainline,Gitorious-backup/mainline,elcom/gitorious,rae/gitorious-mainline,Gitorious-backup/mainline,rae/gitorious-mainline,gitorious/mainline,rae/gitorious-mainline,tigefa4u/gitorious-mainline,SamuelMoraesF/Gitorious