Add inline editing for date

- uses bootstrap-datepicker (https://github.com/Nerian/bootstrap-datepicker-rails)
Merge branch 'edit_date_field' of github.com:cedrics/infopark_kickstarter into cedrics-edit_date_field

# By Cedric Sohrauer
# Via Cedric Sohrauer
* 'edit_date_field' of github.com:cedrics/infopark_kickstarter:
  Add inline editing for date

Conflicts:
	lib/generators/cms/kickstart/templates/app/assets/javascripts/editing.js
	tmp/test_app/app/assets/javascripts/editing.js
cleanup merge artifacts
Merge branch 'cedrics-edit_date_field' into develop

* cedrics-edit_date_field:
  cleanup merge artifacts
  Add inline editing for date