Error loading existing chat rooms
Chat rooms not cloned due to broken HTML
Some fabric file fixes
Do not install requirements
Added build_here option
Fixed billable fields blocked after payment
Added requirements.dev.txt
Removed unnecessary code + PEP8

Fix over 181d5f7ea82a35bc
Added category cleanup functionality to Janitor
Style and PEP8
Change wording of E-agreement/release form
Merge branch 'v1.2'

Conflicts:
	indico/core/config.py