Merge pull request #243 from manalilatkar/stacktach_ping_acceptance

stacktach accepts AH response code as a ping from yagi along with the name of the service and stores it accordingly
Work around for blank deleted_ats
Merge pull request #253 from ramielrowe/blank_deleted_at_fix

Work around for blank deleted_ats
Fixing imageexists migration
Accounting for *.pyc in migrations check
Cleaning up migrations test
Merge pull request #255 from ramielrowe/master

Fixing imageexists migration
Added db APIs for Glance
changed urls according to the review comments