Trimmed down the create and save methods.
Removed logging.
Removed the _get_or_create_session_key call in the create method since
it will be called in save method
Added some more logic based on whether the save method was called with
must_create or not.

Added some files and folders to the .gitignore file.
Updated the boto requirement to 2.8.0
Revert "Updated the boto requirement to 2.8.0"

This reverts commit add8a4a7d68b47ed5c24fefa5dde6e8e372804bf.
Added the default Django session unit tests for session backends
Merge pull request #6 from bjinwright/master

Fix for the TypeError: Unsupported type "" for value "None" erros