Share Route UrlBuilders between server and client

[exyi]

As suggested in #523 we should create a mechanism to share implementations of url generation. Now there are two implementations of the route parsers, and although the server-side one is abstracted by RouteBase, if someone would try to implement custom routing syntax it would fail on the client-side. It may consists of translating UrlBuilders to javascript dynamically or sharing same regex which generates url.

I think creating the UrlBuilders as Linq.Expressions would allow us to use them on server and to translate them to JS using the JavascriptTranslator we use for bindings. Parsing of the routes on client-side is not needed (yet...).