TravisCI set up!

Menno Finlay-Smits
 

I've finally gotten around to setting up TravisCI to run the unit tests.
Tests are running and passing for both the master and 1.x branches, and
the obligatory build status images are now showing on Github.

https://github.com/mjs/imapclient#test-status
https://travis-ci.org/mjs/imapclient/branches

I'd also like to get the live tests automatically running in TravisCI as
well but that will require a little more work.

- Menno

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Menno Finlay-Smits
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