Release of version 2.2

Change log
=========
- Made substantial updates to the ship emission code used in Turkey. This includes many model changes and renames of command line tools.
- Added a new pyAirviro.tools.utils module that can setup argument parsers with standard command line options. It also takes care of setting up logging.
- Bug fix for writing emission grids.
- Minor reformatting of subdb.py.
- Unittest is no longer in the pyAirviro.compat module since it's only guaranteed to be installed while testing.