Release 2.2.0

This is the first release of chardet after merging with [charade](https://github.com/sigmavirus24/charade) (erikrose/chardet#10).  The biggest change is that we've dropped support for Python 2.5 and below, and added support for Python 3. 

Other changes include:

-  Setup Travis-CI for unit testing (and added the previously missing unit test data). Currently the build doesn't fail when the unit tests fail because [27 out of the 384 tests currently fail](https://travis-ci.org/erikrose/chardet/jobs/15529299). In the future, we'll try to make those tests pass.
-  We now require `setuptools` for installation because we rely on that to generate the `chardetect` script.
-  @dan-blanchard is now listed as the maintainer because @sigmavirus24 and @erikrose don't really want to do it anymore. :smile: 

Many thanks to @sigmavirus24 for his work on `charade`.