added ability to use sort order in CSV
refactor ActiveAdmin.flash
make ActiveAdmin.flash’s closable
close after attr for js flash messages
Allow CSV export without column name
Document column_names paramters for csv
Simplify code
some styling for input[type=button] as for input[type=submit]
some styling for button as for input[type=submit]
fix title of pages with active_admin_logged_out layout (fix #3428)
Bump formastic to ~> 3.0
Merge pull request #3432 from strivedi183/update_formastic

Bump formastic to ~> 3.0
remove formtastic locale keys
use formtastic_i18n gem
remove old rake task
helper_method env
for example to access user agent from arbre views
add unsupported browser panel
style unsupported browser panel (close #2678)
add de and de-CH locales for unsupported browsers
fix tests