Updated the interfaces to match #6.
Added createWriteChannel method.
Added createByteStream method to the Channel interface.
Removed netstrings as not part of libchan anymore.

@pelger maybe it makes sense to move those to a package and publish.
Rename of sendChannel into createWriteChannel. Updated README and LICENSE.
Added API to the README.
Remvoed usage.md.
Bumped v0.0.2. First working version.
Merge branch 'master' into spdy

Conflicts:
	index.js
	package.json
	test/abstract_session.js
One-direction over SPDY working.