Cleanup
Improve support for 'type/subtype+suffix' mime types in the colors output formatter.

E.g.:
* application/ld+json
* application/hal+json

Closes #189, #206
Avoid “__init__.py” files in test directories.

As recommended here:

	https://pytest.org/latest/goodpractises.html
Added wheel support

Should make installation via pip work on OSX Mavericks (#148).

Also added a nifty Makefile.
Fixed Makefile, added setup.cfg.