update Heroku docs to reflect Django 1.7 migrations

Fixes #31
Merge pull request #39 from jsatt/31-update-heroku-docs

update Heroku docs to reflect Django 1.7 migrations
[requires.io] dependency update
Merge pull request #40 from codesy/requires-io-master

[requires.io] dependency update on master branch
Update django to 1.7.1
Merge pull request #41 from groovecoder/django-1.7.1

Update django to 1.7.1
doc fixes as I went thru them again
Merge pull request #42 from groovecoder/update-docs-2014-10-22

doc fixes as I went thru them again
fixes #30 - add User API and PATCH with CC token
Merge pull request #43 from groovecoder/fix-adding-card-to-user-30

fixes #30 - add User API and PATCH with CC token