Basic HTTP2 unit tests

This code is identical to the patches uploaded to bugzilla, except that I added a linux 64bit node binary that supports ALPN, and patched node-spdy to support ALPN too.

I can do a cleaner pull request (without this two thing) if you want me to. I also plan to upstream the node-spdy changes, so it's maybe cleaner to wait for a new node-spdy release conatining the patch and then update node-spdy.