Make Bot testable and add unit tests.

[brooklynDev]

Currently the bot correctly relies on an IHubProxy however instead of this getting injected, it's created on the fly in the constructor, thus preventing any simple mocking/stubbing. There's enough logic in the bot itself (and I predict that it'll just grow over time) that warrants a good suite of tests. Once the IHubProxy is injected properly, unit tests should be added to test the various bot commands available.

[brooklynDev]

I'll tackle this one tonight.