Flesh out pull request closing functionality.
Flesh out pull request closing functionality.

rsalevsky/crowbar,mmnelemane/crowbar,aplanas/crowbar,mmnelemane/crowbar,dirkmueller/crowbar,SUSE-Cloud/crowbar,MaximilianMeister/crowbar,rhafer/crowbar,rhafer/crowbar,rsalevsky/crowbar,aspiers/crowbar,MaximilianMeister/crowbar,toabctl/crowbar,dirkmueller/crowbar,aspiers/crowbar,nkrinner/crowbar,crowbar/crowbar,aplanas/crowbar,rhafer/crowbar,toabctl/crowbar,crowbar/crowbar,tserong/crowbar,nkrinner/crowbar,vwallfahrer/crowbar,SUSE-Cloud/crowbar,vwallfahrer/crowbar,tserong/crowbar