Test runner

[tswicegood]

This adds a runtests.py file to make executing the tests easy along with the necessary configurable to run the tests automatically on push inside the Travis CI (not related to me) infrastructure.

For an example test run, see http://travis-ci.org/#!/tswicegood/django-ses/builds/624447

[tswicegood]

As a side note, the runtests.py file can be run through Pycco to generate an annotated version of the source.

[michaelklishin]

To clarify:

language: python

will work exactly the same as

language: ruby

because all "unknown" languages are ignored and by default builds land on Ruby workers. Once Python is supported, such builds will be routed differently but you won't have to change your .travis.yml.