tests

[steenzout]

• added .travis.yml
• added tox support
• use pytest for testing
• setup tests for Python 2.7 and future 3.x versions
• re-organized tests into its own tests directory
• separated integration from unit tests
• added test dependencies into requirements-tests.txt
• updated .gitignore rules
• added unit test for stencil.tokenise

[steenzout]

helps with #9

[funkybob]

Ideally, also, the hand-crafted test loop should be broken out into proper test method.

[steenzout]

@funkybob how about now?

[steenzout]

travis-ci.org report here