Lock celery requirement to 3.0.x
Lock celery requirement to 3.0.x

wfxiang08/changes,dropbox/changes,dropbox/changes,bowlofstew/changes,bowlofstew/changes,dropbox/changes,wfxiang08/changes,wfxiang08/changes,bowlofstew/changes,wfxiang08/changes,bowlofstew/changes,dropbox/changes