select2 files
new requirements for plugins (select2)
gemfile select2
js that adds the btn bootstrap class to all submit buttons
Add select2 class to Area field in a couple of forms
Added "session"  to the new nota and new pase forms
Add new search_field class for better styling in the search form datepicker fields.
Cleanup in seachform (Better labels etc).
Merge branch 'backend'

Conflicts:
	app/assets/javascripts/backend.js
Remove duplicate calls.