feat(airclient): initial codebase work (Message/Command parsing)

The base amount of work has been done. There are things here which are potentially
painful, performance-wise, which may need to be thrown away later.

Hopefully this will be able to put together some cool iOS and OSX clients in the not
too distant future.

As a note, this is experimental work, largely inspired by work on a plugin-enabled
IRC bot written in Node.js. Lets see how it pays off.
chore(.git): add gitignore to repository
docs(README): add LICENSE and README.md to repository