[MISC] Do Minor cleanups
[TESTS] Cleanup py2c/tests/__init__.py, rename a helper function
[TRANSLATOR, TESTS] Cleanup py2c.translator and it's tests.

py2c.tests.test_translator now uses nose exclusively.
[DEV_TOOLS] Clean coverage report, test-runner. Add a new ast-printer for assisting with modifiers.
[SYNTAX_TREE] Make tests for subclass and instance consistent for singleton
[PY_MODIFERS] Add py-modifier for 'assert' statement with tests.
[PY_MODIFERS] Add py-modifier for 'for' statement with tests.