Add .travis.yml
tweak .travis.yml
Merge branch 'fix_unittests' into travis
Only use python 2.7 and 3.2
This should make it run with python3.
Try python 3.3
Add travis build status icon to README.
Merge branch 'travis' into fix_unittests

Conflicts:
	test/test_with_fixtures.py
rm test_with_fixtures.py and related files.
rm fragile unittest in test_main.py.
autopep8: test_main.py
autopep8: test_catkinize_cmakelists.py
Move is_valid_version to catkinize/utils.py
Move doctest of version_validator to test_utils.py