More mailer tweaks, still does not work properly
Merge branch 'develop' of github.com:guluc3m/gul-gultalks into develop

Conflicts:
	app/mailers/notifier.rb
Missing update to event var
Fixing missing mailer filters
Cleanup and refactoring
Added locales for week days in Spanish
Added ActiveAdmin panel
WARNING: does not work properly due of the event IDs

- Added ActiveAdmin plus i18n gem
- Conferences and Events added to the panels
Added Activeadmin routes
Fixing mailer methods
Refactoring  mailer
Fixed ActiveAdmin not migrating correctly and Notifier typo. ActiveAdmin should now work with FriendlyId