Remove devise require from spec_helper.rb
Remove devise initialiser from test_app
Remove devise from readme
Add railtie to extend active support for notifiable keyword
Move notifiable into lib/fwt_push_notification_server
Remove cancan and devise dependencies from gem
Remove empty tokens helper
Add rail tie initialisation
Remove cancan and devise from engine
Update test_app user model

Remove devise, add notifiable
Merge pull request #14 from FutureWorkshops/remove_devise

Remove devise and cancan dependancies