Bump Rails to 3.2.12

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Use Strong Parameters instead of attr_accessible

* Because mass-assignment protection belongs in the Controller.

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Upgrade Devise to 2.2

* Also compatible with Strong Parameters.

Signed-off-by: Alex Coles <alex@alexbcoles.com>