Bug 825071: remove support for PXE config changes from the set-state API; r=jhopkins

These aren't used, and the implementation's a little ugly.
insert images with a hidden column; r=armenzg
Merge branch 'master' of github.com:djmitche/mozpool

Conflicts:
	testdata.py
Bug 828030: clean up requests; r=mcote
Bug 828492: Bump to 2.0.0, add release notes