Move the rss module files to their new homes (rename-only commit).

--HG--
rename : modules/rss/controllers/rss.php => modules/rss/classes/Rss/Controller/Rss.php
rename : modules/rss/helpers/rss_block.php => modules/rss/classes/Rss/Hook/RssBlock.php
rename : modules/rss/helpers/rss.php => modules/rss/classes/Rss/Rss.php
rename : modules/rss/views/rss_block.html.php => modules/rss/views/rss/block.html.php
rename : modules/rss/views/feed.mrss.php => modules/rss/views/rss/feed.mrss.php
Fix the rss module class declarations.
Add the rss module transparent-extension-enabling files.
Search and replace in rss module (31 places) and in gallery module for rss-related terms (3 places).
Search and replace manually in rss module.  This is only the "_rss" --> "Rss" changes.
Add "Hook_" in front of hook class names.  @todo - write one function to handle all of these cases.
Merge pull request #239 from shadlaws/k3_rss_module_translate

K3 rss module translate, fix hook class names.