Added logout
Added csrf filter to UserController + CharityController's post methods
Added authentication requirement for creating a charity
Updated the _flash template to allow for message_succes, message_error and
    message_alert
Added ability to view all charities at /c/
Updated the create_charities migration to ensure the charity name is unique
Fixed OAuth return message. Now shows message_success when login successful
Fixed Dashboard logout messsage too
Added the address fields to the charity creation form
Updated the create_charity migration to add column for address
Updated the Charity Model to validate the new address field
Updated the charity/create view to show the new fields
Cleaned up the users/register view template + fixed label placeholder mis-match