Refractored test_oct2py.py's test code.
Merge pull request #47 from cel4/test_refractoring

Refractored test_oct2py.py's test code.
More direct _Session.close() method.
Streamline travis to reduce extraneous output
More travis streamlining and fix octave add repo
Add warnings to tests
Add coverage to conda install line
More travis changes
Handle __del__ more gracefully