Prepare URL-rewriting

Add sample rule in .htaccess
Manage RainTPL base_url in config
Ready for URL-rewriting

RainTPL modified to handle base url in form's action
Fix form action issue

Please use `action="#"` to point on the same page instead of `action=""`
URL-Rewrite feed/*
Merge branch 'master' of https://github.com/FreederTeam/Freeder