Split plugin and server

Also, the makefile depends on libuv now, even though it's not used. Gomen.
Half-added libuv
Add working echo server

The final api is asio+websocketpp.
Updated readme
Full port
Fix PORT value, cleanup
Create CmakeLists

Works just fine on linux, as usual. Windows seems harder.
Merge pull request #23 from Alloyed/ws++

Websocket++ port