Modularize

[farmdawgnation]

I think it's probably time to modularize this thing a bit.

There are a few dividing lines I can see immediately... things like

1. Core Jenkins interactions (auth/http methods/etc)
2. "Job" things (e.g. changing the branch)
3. "Build" things (reading output, watching)
4. Helper methods.
5. The message regexes etc

WDYT? Does this seem like a reasonable division? I could whip up a sample PR at some point soon if so.