Merge pull request #7 from todesschaf/master

Add support for selecting example server port.
README: shortening an example.
Adding :scheme :host and :method headers. Fixes #8.
Merge branch 'master' of github.com:molnarg/node-http2
Connection: more comments.
Connection: forcing initial settings to contain SETTINGS_MAX_CONCURRENT_STREAMS and SETTINGS_INITIAL_WINDOW_SIZE.
Connection: collection TODOs in a new subsection at the end of the file.
Connection: handling incoming SETTINGS frames.
Connection: implementing stream number limitation (SETTINGS_MAX_CONCURRENT_STREAMS).
Tests: fixing failing tests caused by checking for mandatory settings in Connection.
Connection: a new log message.
Connection: new TODO.
Connection: adding close() method.
Connection: sorting out push and infrastructure for priorities.
Updating docs.
Using  in the framer.
Moving incoming control frame handling in the _writeControlFrame method.
Connection: simplifying and commenting stream management code.
Stream: sorting out PROMISE state transitions. Fixes #6
Stream: fixing typos.