issue 83 IE9/10: returned if this.xhr was undefined
Merge pull request #132 from asdfryan/master

Issue 83 fix: IE9/10 error
added query.eio to take protocol version from parser. Also changed Socket.protocol to take that same protocol version
capitalized eio, added a comment saying that the protocol is an int, not a string
Merge pull request #133 from asdfryan/eioversion

Issue 65 fix: Added eio query string