Removed references to 'window' object
Added Go server

The code is from http://code.google.com/p/webrtc-datachannel-polyfill
developed by Alfred Knallfred Godoy (alfred.knallfred.godoy@gmail.com),
but I bet that his polyfill implementation was stoled from mine... It's
not normal that has the same structure and also almost the same vars
names...