Save the recommended.py list of families when saving RMG-database.
Add functions for saving the transport and solvation databases.

Currently saveEntry for solvation is still NotImplemented
Make aromatic unit tests a bit more descriptive.
Clean up print statements in unit tests.

Conflicts resolved:
	rmgpy/data/solvationTest.py
	rmgpy/molecule/groupTest.py
Remove old coverage files before running nose tests when using 'make test'

Otherwise we get an error message when trying to save the html coverage files.