Jan-Grimo Sobez

I recently tried to add a fingerprint field to a model and then perform a migration. Following the [documentation](http://django-rdkit.readthedocs.org/en/latest/fields.html), which suggests > `class django_rdkit.models.BfpField(**options)` > A bit vector fingerprint. It...

Add trim of changed lines only

4

Closes #22. Adds the config option `trim_changed_only` (default `false`). I think this is a relatively neat fix that even retains leading lines and trailing lines trimming for only changed lines....