Added a stricter definition of rotatable bonds as a new function in the CPP, Python, Java and DB cartridges
merge pull request #211
backup commit
Fixes #220
Merge remote-tracking branch 'origin/master'
Merge pull request #221 from mwojcikowski/master

Support passing of file-like PandasTools.LoadSDF
passes C++ and python tests
merge in new rotatable bond definition.
Fixes #211
steps towards #222
at least now agents no longer generate parse errors
Add Travis support