Unit tests for the services module. Requires pytest.
Better assertion test for Error testing
requirements-dev.txt added

--HG--
rename : requirements-doc.txt => requirements-dev.txt
Rewrote sonoshell.py to use print_function from __future__.
Updating unittests.rst for new pytests
Merge pull request #59 from petteraas/futurePrintSonoshell

Rewrote sonoshell.py to use print_function from __future__.
Merge pull request #53 from lawrenceakka/pytests

Unit tests for the services module. Requires pytest.