Comfiguration file for Travis CI.
Only refresh files that are effectively out of date.

The equality condition between pyc and py caused site.py to
be reloaded every time, and an infinite recursion on Travis CI
because of a conflict with distribute/site.py
FIX Missing import in regression test.
Travis CI: install before running tests.
unittest compatibility with Python 2.6
Travis CI: install unittest2 for Python 2.6 compatibility
Merge pull request #47 from pberkes/travis-ci

Travis CI