Add a Travis configuration to Gerritbot

This allows it to have the tests run through Travis CI.

2014-09-27 Patch set 2: include install and running info

Change-Id: I7b6921ae1d02d70d8a558c5f71f437ab03d0aff1
Merge branch 'add-travis' into tidyups

I want travis support for what I'll be doing shortly.
Python 3: convert to using print as a function

Change-Id: I0bd85b2acc639f4538d0f92e3aae47b44b764333