Meta tag model creation

* Adds more translations for english
* Change routes for products in admin
* Adds more gems in gemspec
Meta tag model creation

* Change metatags controller for inherit from resource controller
* Adds deface to add metatags menu to products
Meta tag model creation

* Change metatags#index to use conventions from spree-2-2
* Change metatags#new to use conventions from spree-2-2
* Creates metatags#edit view