Be less greeedy when extracting context for MR comments.
Be less greeedy when extracting context for MR comments.

Don't extract lines from every line with the same diff tuple, just the current
blob. This should resolve issue #69

ericbutters/eric-gitorious,spencerwp/mainline,spencerwp/mainline,tigefa4u/gitorious-mainline,vymiheev/Gitorious-OpenStack,elcom/gitorious,SamuelMoraesF/Gitorious,Gitorious-backup/mainline,rae/gitorious-mainline,vymiheev/Gitorious-OpenStack,deld/gitorious,elcom/gitorious,altrair/gitorious-openstack,Gitorious-backup/mainline,njall/wel-gitorious,feniix/gitorious,gitorious/mainline,spencerwp/mainline,tigefa4u/gitorious-mainline,rae/gitorious-mainline,gitorious/mainline,elcom/gitorious,tigefa4u/gitorious-mainline,Gitorious-backup/mainline,deld/gitorious,njall/wel-gitorious,rae/gitorious-mainline,deld/gitorious,feniix/gitorious,SamuelMoraesF/Gitorious,Gitorious-backup/mainline,altrair/gitorious-openstack,ericbutters/eric-gitorious,altrair/gitorious-openstack,feniix/gitorious,grjones/gitorious-submodule-dependencies,ericbutters/eric-gitorious,gitorious/mainline,SamuelMoraesF/Gitorious,rae/gitorious-mainline,tigefa4u/gitorious-mainline,SamuelMoraesF/Gitorious,gitorious/mainline,elcom/gitorious,njall/wel-gitorious,grjones/gitorious-submodule-dependencies,spencerwp/mainline,grjones/gitorious-submodule-dependencies,vymiheev/Gitorious-OpenStack