The main purpose of this release is to improve the handling of nltk data dependencies.
In particular, the expand_EXPN function depends on nltk's 'averaged_perceptron_tagger' and 'universal_tagset' , but had a bare except that caught the LookupError raised when a user didn't have these dependencies installed, and just did a no-op on strings recognised as abbrevations. This seems to be the cause behind 109 and 117
Now, we explicitly handle and raise the LookupError, so it's clear to the user what's causing the problem and how to fix it.
More minor changes:
* Add a section in the README to call out that these dependencies need installing, and giving commands for that
* Add some missing import statements from code snippets in the README
* Update author email in setup.py