Incremental update - bug fixes, refactor for multi-language support, termset updates

• #7 Bug fix to fix issue in spacy 2.1.8 where using an entity ruler and not finding any entities would cause doc.is_nered to return false. This would make negspacy believe named entity recognition was not performed, throwing an error, incorrectly.
• moved patterns to termset lookup file, making it easier to support multiple languages. #6
• add additional patterns (contractions)

Incremental Alpha release - user specified terminology lists

• Users can specify negation terminology
• Improved error handling

Alpha version with windows bug fix

v0.1.1

Merge branch 'develop'

Initial alpha release

v0.1.0-alpha

Update setup.py