Initial requirements for Release-feature
Make backlogs issue history-function usable for release history.

Possibly candidate of refactoring to move sprint specific logic away from history().
Initial rework of release graph
Update new release graph to use unified journal
Updated CSV export for new release graph data
Merge branch 'master' into bohansen_release_chart

Conflicts:
	app/models/rb_release.rb
	app/views/rb_release_burndown_charts/_burndown.html.erb
	config/locales/fr.yml
Merge branch 'master' into bohansen_release_chart
Merge branch 'master' into bohansen_release_chart
Merge remote branch 'backlogs/master' into bohansen_release_chart
Corrected sprint selection for release
Merge branch 'bohansen_release_chart' into releases3-merge-bo

Conflicts:
	app/models/rb_release.rb
	app/models/rb_story.rb
	app/views/rb_release_burndown_charts/_burndown.html.erb
	config/locales/fr.yml
	config/locales/ru.yml
	config/locales/zh.yml
	features/release.feature
	lib/backlogs_issue_patch.rb
fix lexer error in release burndown test
restore mismerged rb_release functionality
rename issue::history to release_history.
patch ReleaseBurndown to gracefully do nothing if there is no closed sprint
implement sprints and closed_sprints for release as AR relations
Merge branch 'releases3-merge-bo' into releases3