v1.3.3
Merge branch 'devel' of github.com:jlafon/PynamoDB into devel

* 'devel' of github.com:jlafon/PynamoDB:
  Adding an example.
  Fixing dict key casing
  Bug fix for create_table where multiple indexes share the same attribute that is not a key attribute.
Added a new test for table creation on indexes that share an attribute
Appended AUTHORS
Flake8 fixes