documentation updated, version bumped to 1.2.0
Merge branch 'master' of ssh://github.com/allegro/ralph
minor fixes in the change log
significantly simplified util.output to fix RQ performance issues

Merge branch 'master' of ssh://github.com/allegro/ralph

Conflicts:
	CHANGES.rst
treat all discovery exceptions in interactive mode in the same way
Merge pull request #537 from ambv/master

Exceptions in plugins propagate