Make iab pip-installable and testable via Travi-CI

Fixes #10, #19. Also had to update distance matrix references to work with latest scikit-bio (nose was able to catch this much at least even though there aren't tests yet!).

Not sure if this will trigger an initial test via Travis, since we haven't pushed to the repo since enabling and we don't have a .travis.yml yet (besides the one in this PR). Let's hold off on merging for a bit to see if a Travis build is triggered (there still may be kinks to work out).