add unicode test to SNL, modify is_valid to use encode/decode
Minor formatting changes.
simplify SNL code
restore SP's solution for filtering Unicode. Give up trying to filter Unicode...
Improve robustness of parsing Gaussian input files.
Further improve parsing of titles from Gaussian input files.
Fix Molecule and Site eq to take into account properties.
Support for molecules in SNL.
Implement __ne__.
Add from_string method to BabelAdaptor.
Update install instructions for openbabel for Mac - finally got it to install
properly.
More updates to openbabel docs.
Minor grammar fix.
Fix from_string for open babel.
 Add unittest for from_string.
Bug fix for parsing very odd Gaussian input files. Added unittest.
Even more improvements to GaussianInput parsing.
Streamline GaussianInput parsing code.
Make commonly used regex class variables.
Further improves robustness of parsing Gaussian input files.