Move the rest module classes to their new homes (rename-only commit).

--HG--
rename : modules/rest/controllers/rest.php => modules/rest/classes/Rest/Controller/Rest.php
rename : modules/rest/helpers/registry_rest.php => modules/rest/classes/Rest/Hook/Rest/Registry.php
rename : modules/rest/helpers/rest_event.php => modules/rest/classes/Rest/Hook/RestEvent.php
rename : modules/rest/helpers/rest_installer.php => modules/rest/classes/Rest/Hook/RestInstaller.php
rename : modules/rest/models/user_access_key.php => modules/rest/classes/Rest/Model/UserAccessKey.php
rename : modules/rest/helpers/rest.php => modules/rest/classes/Rest/Rest.php
rename : modules/rest/libraries/Rest_Exception.php => modules/rest/classes/Rest/Rest/Exception.php
rename : modules/rest/views/error_rest.json.php => modules/rest/views/rest/error_rest.json.php
rename : modules/rest/views/reset_api_key_confirm.html.php => modules/rest/views/rest/reset_api_key_confirm.html.php
rename : modules/rest/views/user_profile_rest.html.php => modules/rest/views/rest/user_profile_rest.html.php
Fix the rest module class declarations.
Add the rest module transparent-extension-enabling files.
Tweak the names of some rest module views.

--HG--
rename : modules/rest/views/rest/error_rest.json.php => modules/rest/views/rest/error.json.php
rename : modules/rest/views/rest/user_profile_rest.html.php => modules/rest/views/rest/user_profile.html.php
Search and replace in rest module (75 places) and in gallery module for rest-related terms (118 places).
Search and replace manually in rest module.  This is mostly the "helper/*_rest" --> "Hook_Rest_*" change.
Merge pull request #238 from shadlaws/k3_rest_module_translate

Convert rest module to K3-speak.