Tests and release tweaks

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This adds some changes to help with with dev/releases:

• get the package version from git, rather than being hard coded
• add package classifiers
• use Travis to run smoke tests (you'll have to set it up, but it is trivial)
• build package wheel
• replace shell script so the package will work with pipsi
• only recommend installing with pipsi or pip

The package may be compatible with 2.7 and 3.3+, versions lower than that will at least have syntax issues - simple colouring works in these versions (covered by smoke tests).

This also changes what happens when you run publish from setup.py, it will now build a wheel instead of a source distribution.

I noticed there have been a couple of tagged releases, but no corresponding releases on pypi - if you'd like a hand with it let me know.

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I just rebased and sorted out the merge conflicts along the way.

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Is there any feedback on this? I'd quite like to see the console_scripts changes get out in a pypi release so people can just do pipsi install colout to get and use this.

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Poking as I'd like to get this cleared away