Allow for caller defined ioloop
Pass parsed json response for errors to be compatible with boto 2.3

The API for DynamoDBResponseError changed as a result of
https://github.com/boto/boto/issues/625
Safer handling when no json response is available
Merge pull request #4 from rhettg/344ec96b72ae76036f1a3ef12252c07f1a08e5d9

Allow for providing our own ioloop
bump version - sorta
Merge pull request #5 from rhettg/rhettg_errors

Pass parsed json response for errors to be compatible with boto 2.3
version 0.2.6
update readme and download url from setup.py