Removed deprecated md5 hash call.  While this will limit this library to only modern versions of Erlang, it works fine for my purposes.
Reformatted code.  Added DynamoDBLocal Scheme/Port override to allow for local DynamoDB testing simply by providing the URL in the config call.  Added in-module EUnit test (since the URL method is local and does not need to be exported.
Added additional ignore entries for IDE-specific files.
Fixed inconsistent -include() vs -include_lib() usage,
Enabled verbose EUnit output.  Just my preference.