add doc for unsubscribe method
start non-jquery version
Ajax Mediator

Added xhrhandler function to act as a compact ajax mediator. It kinda
supports the current $.ajax call syntax, but I'm not extremely familiar
with jQuery, so I did not change it yet.
requestType fix
$.ajax replaced

Replaced the $.ajax call with an xhrhandler call that returns the
responseText after a synchronous/imperative-style XHTTP call.
updated readme to remove jquery
delete jquery version
added example implementation. Removed doing arrays to the channels. Future subscribe() and fetch() calls now replace an existing channel.
updated readme with example
updated readme
updated readme
added live example