XHR-polling support to socket.io

This patch fixes issue #35
Merge pull request #129 from omailson/xhrpolling

XHR-polling support to socket.io
fix minor breakage in test
socket.io xhr: do not reuse builder.
style fixes (this.)
Merge branch 'master' of https://github.com/koush/AndroidAsync

# By Koushik Dutta (2) and Mailson Menezes (1)
# Via Koushik Dutta
* 'master' of https://github.com/koush/AndroidAsync:
  socket.io xhr: do not reuse builder. style fixes (this.)
  fix minor breakage in test
  XHR-polling support to socket.io