Use upstream qless-core again
Use upstream qless-core again

First step into reconciling with mainline qless. See https://github.com/custora/qless/pull/3 for why we created our own repo for qless-core. The changes we were adding there ahead of Moz are now merged into the mainline (https://github.com/seomoz/qless-core/pull/64). I tested qless on staging yesterday and ran jobs with seomoz/qless-core without issues.
custora/qless,custora/qless,custora/qless,custora/qless