Meta tag model creation

* Rename meta_tags for metatags
* Adds more actions for metatags controller
Meta tag model creation

* Replace extension of overrides from erb to haml
* Change syntax of defaces from erb to haml
Meta tag model creation

* Adds haml-rails to the party
* Change spree version of extensions from 2.3 to 2.2
Meta tag model creation

* Adds more actions to metatags controller
* Adds scope to spree/metatag model
* Adds more translations to locales/en.yml