User friendly

[darkl]

There should be an easy way to start using WampSharp, without plugging components one inside another.

The proposed idea is to have two main entry points:

-WampChannel - provides IWampServer proxies or IWampRpcClientFactory, the only parameter it gets in the constructor is the address of the server to connect to. (Note that a IWampServer proxy is tied to a IWampClient, so the user should pass an IWampClient to the method that provides the IWampServer proxy)
-WampServiceHost - provides a WampListener that routes messages to a given custom WampServer or to a predefined WampServer that routes RPC calls to user methods and etc.

Dependency injection (Ninject) looks suitable here, but should be checked.