waynehoover/s3_direct_upload — pull request #103 by mfrost (2013-06-12 16:15:32+00:00)
Title: Allow form helper to control content type policy

Based on the examples [here](http://docs.aws.amazon.com/AmazonS3/latest/dev/HTTPPOSTExamples.html), it seems like it is pretty straightforward to restrict the type of files using a stats-with policy.

It used to default to an empty string. This patch allows a developer to supply another option to the form helper to customize that policy.