New spec updates

If you haven't noticed from the storm of Bugzilla updates, a new batch of
Web Crypto updates are out - which will hopefully avoid further batching.

https://dvcs.w3.org/hg/webcrypto-api/shortlog

Notable improvements (note: these were all open bugs)
- JWK-as-object, as discussed prior to LC, is specified
- Algorithm normalization is now (hopefully) fully specified, and prior to
asynchronous invocation
- interface KeyAlgorithm is dead. Long live dictionary KeyAlgorithm (in
response to TAG)
- Lots of validation improvements on input parameters
  - ECDSA, ECDH
  - RSA-OAEP is now specified for handling SHA-2 algs
- RSA-ES is gone
- CryptoOperationData cloning is now fully defined (using ES6 terms)
- Significantly reworked security considerations (thanks to everyone who
contributed)


On the editorial side, a number of consistency issues were fixed, although
I still have a few bothering my obsessiveness.

There are still 37 open bugs, although a few I'll be proposing to be closed
as WontFix, with explanations, in follow-up