bug 1066058; add Support Reason API crashstorage type

*Preamble: This PR is primarily submitted for discussion purposes (I expect more work to be necessary).*

This adds the `SupportReasonAPIStorage` class which is a sub-class of `BotoS3CrashStorage`; functionally speaking, the former is basically a *highly lossy* implementation of the latter.

cc @twobraids 
cc @lonnen @twobraids 

That's an unfortunate example. I think I'm equally guilty sometimes of referring to it as "uuid" and clearly lonnen did too made the same mistake. 
I don't exactly where the discussion happened in verbatim but Lars started it and decided almost un-democratically that from now on we're going to call it "Crash ID" (or "crash_id"). The most important thing was that we made a decision at all and stuck with it. 

The team responsible for reading the S3 URLs and pulling out the `reason` array did probably not request/require that we embed the `uuid` in there. I think it was Lonnen's idea. If I'm wrong, we ought to reach out and convince them that the established nomenclature is "Crash ID" spoken and "crash_id" when in code. 

Right?