[BC Break] Feature adding prefix

See discussion #77 


BC Break : 
 - all forms have been prefixed with `afe_` string
 - Twig functions `form_javascript()`  and `form_stylesheet` have been prefixed with `afe_`
 - Javascript and Stylesheet form blocks have the following format: 
    * `formname_afe_javascript`
    * `formname_afe_javascript_prototype`
    * `formname_afe_stylesheet`