Enable release burndown graphs again
Added mode full to render release graph using burndown.js
Release burndown is now shown already when a release contains a story.
Added skeleton for complex test of release burndown
Fixed regression + ordering and date range of sprints for releases.
added missing steps in test + extra story X to make sprint 5 appear in the burndown
Added stories which has been member of release to burndown + check for continued stories
whitespace fixes
Release burndown calculation passes
Merge remote-tracking branch 'origin/master' into release_graphs
Merge remote-tracking branch 'origin/master' into release_graphs
Merge branch 'master' into release_graphs
Offset calculation fixed for release burndown + burndown color
Merge remote-tracking branch 'origin/master' into release_graphs
Added release burndown test to travis
explicit exit travis script on error
Fix 1.8.7 compatibility for filter_release
Changed to date axis for release burndown
Merge remote-tracking branch 'origin/master' into release_graphs

Conflicts:
	app/models/rb_issue_history.rb
Temporarily fix related/copied to for continued stories in all supported RM versions.