Scrub data

Given an object, will scrub sensitive information from it.

Still in progress so lots of comments left, just looking for feedback on the types of scrubbing done. Specific questions:
1) Instead of trying to only remove the important parts of the text, we could just delete the whole key if there is any banned word there. Ensure we won't leak info, but makes the error less useful.
2) Are s3 filenames sensitive (do we want to scrub them)?