Camplight

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* Fix exit status of `python setup.py test`.
* Update copyright year in LICENSE file.

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* Fix JSON decoding in case no text is returned. Reported by astiam.
* Travis: run tests against Python 3.3.

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* Fix path to Camplight module in unit tests.
* Update to Requests version 1.0.3.

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* Use [pytest](http://pytest.org) for unit testing.

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* Add test coverage using [coverage.py](http://nedbatchelder.com/code/coverage/).
(keimlink)
* Properly set `tests_require` and `extras_require` in setup.py. (keimlink)
* Work around dependency error returned by `pip install` by hardcoding the
current Camplight version in setup.py. (jwilder)

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* Add unit tests; run them via `python setup.py test`.
* Add Travis CI config.
* Python 3 compatibility.