Changes:
- added color to output to make it easy to see at a glance files or settings that didn't change (blue) and those that did (green)
- added support for specifying your credentials in the standard [.aws/credentials](http://docs.aws.amazon.com/cli/latest/userguide/cli-chap-getting-started.html) file that is used by other tools including the AWS Command Line Interface
- updated code to use Python 3 and [boto3](https://github.com/boto/boto3)
- fixed crash when trying to upload empty files (issue 1)
- fixed failing to do CloudFront invalidations when there are more than 3000 to do at once
- updated documentation