[#79863386] S3 configurator

Opening this up for discussion.

Created S3FigureConfigurator service class according to given spec.
I think I misinterpreted this part of the [aws guidelines] (http://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-HTTPPOSTConstructPolicy.html).  I'm checking for special characters **after** base64 encoding.  I think we need to check _before_ encoding.
![image](https://cloud.githubusercontent.com/assets/2043348/4495735/96baa6e2-4a5e-11e4-9dd8-843c40ced0d3.png)