[#82988170] Admin DOI interface matches mocks
[#82988170] Prevent editing of starting number
Merge remote-tracking branch 'origin/master' into doi_ui

Conflicts:
	app/assets/javascripts/templates/journal/index.hbs
Do not validate if the field is empty
[#82988170] renamed doi start variable in ember
[#82988170] fix specs and some markup
Upgrade to Ruby 2.1.5
Allow source to be a changeable computed property
Replace chosen with Select2 on contributors overlay
Fix spec
Merge pull request #642 from Tahi-project/select2_on_add_collaborators

Select2 on add collaborators
Merge pull request #624 from Tahi-project/doi_ui

DOI UI
re-remove author groups and message participants from schema
[#79321200][bugfix] Show long title in the Workflow
Merge pull request #636 from Tahi-project/ruby_2_1_5

Upgrade to Ruby 2.1.5
Add export action for dynamic download types
Add EPub uploader
Add PaperConverterController and Worker
Add base paper controller test
Update to Ruby 1.9-style hash syntax