Switch to PHP namespaces #53
Description
Midgard MVC code should live under the Midgard\MVC namespace and we should utilize a PHP standards autoloader:
http://groups.google.com/group/php-standards/web/psr-0-final-proposal
Since the entry point to Midgard MVC is midgardmvc_core::get_instance(), this rootlevel class should be kept available for backwards compatibility purposes. The target is to keep the component API unchanged.
The only other compatibility class we need is midgardmvc_core_request which extends Midgard\MVC\Request, as most component controllers have this as a typecasted parameter.