enable travis-ci

Unit tests are great, but unit tests that get run automatically upon commit by some third-party is even better.

The steps to enable travis-ci from here is pretty simple.  Follow step one and two from this guide, once this commit has been merged to master:  http://docs.travis-ci.com/user/getting-started/
nice catch.  
(spoiler: many of these envi tests were originally generated from envi disassembly, the initial goal being to get a baseline to compare against over time)