Route: support request method in route matching and fix _match/_meta in compile

Two things in this pull request

Added request method to route matching ( match() ) 
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route matching works as follows:
- routes defined without a request method match for all request methods
- routes with request method GET

    Router::connect( '/get', array("http:method" => "GET", 'controller' => 'mycontroller', 'action'=> 'do_get'));

    //both match for route definition (GET is used as default)
    Router::match(array('controller' => 'mycontroller', 'action' => 'do_get', 'http:method' => 'GET')) 
    Router::match(array('controller' => 'mycontroller', 'action' => 'do_get )) 

- routes with other request methods, e.g. POST

    Router::connect( '/post, array("http:method" => "POST", 'controller' => 'mycontroller', 'action'=> 'do_post'));

    // matches route definition
    Router::match(array('controller' => 'mycontroller', 'action' => 'do_post', 'http:method' => 'POST'))
    // does not match
    Router::match(array('controller' => 'mycontroller', 'action' => 'do_post'))

I could imagine some people find it nice not to pass http:method for POST etc. but I think this way of matching is more consistent with route definition. Also i actually needed it in one case where I wanted two URLS for get and post pointing to one action.

It clearly can break existing applications that do make use of http:method in the route definition and do not pass it to match().

Fixed different behavior of for _match/_meta depending of the presence of parameters in route templates. 
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In cases the route template contained parameters _meta (i.e. options with ':' were handled differently than if no parameters we used (  Route->compile() )


Also created tests for routes with specified request method.

First change clearly can break existing applications that do make use of http:method in the route definition and do not pass it to match(). It should be discussed . Second change (_meta) should be applied anyways as it seems to be a bug.