Registering waveform plugin and generic refactoring.
Added test for is_evt().

Also removed the warning from the is_evt() function.
Globally register test case.

Also renamed the tests to be discoverable by the test runner.
Renamed `obspy.evt` to `obspy.kinemetrics`.
Bugfix plugin registration.
Compatibility for Python 2.6/2.7/3.3/3.4
Refactoring