Django 2 compatibility

opt/django code updated to support Python 3 and Django 2.0
Improved code formatting

Python 3 support

Python 3 support added
Upgraded to version 3 of ESV API

Multi book

Multi-book support added. New 'end_book' optional parameter for Passage initialisation function.
New PassageDelta class for extending passages by arbitrary number of verses or chapters
Added Passage.text and PassageCollection.text functions
Deprecated get_passage_text function
Deprecated Passage.extend function
Renamed Passage.osisRef function to Passage.osis_reference
Removed book_total_verses function from Passage object; creating a stand-alone version in its place

In the beginning

First release!