Feature/annotation

As discussed in #36, this now provides the ability to use docblocks, specifically `@method` and `@uri` variables.  For example:

    <?php
    class MyController {
        /**
         * @uri /foo
         * @method OPTIONS
         */
        public function indexAction() {
            echo 'This is only available via: OPTIONS /foo';
        }
    }

Note that @uri is only relative to a mount point if specified, e.g.:

    $mux->mount('/mountpoint', $controller->expand());

but will override the default uri generated from the action names.