Editor's draft update

All,

I updated the Editor's Draft today:

(1) to align with the latest JWK draft (
http://tools.ietf.org/html/draft-ietf-jose-json-web-key-20) that includes
the "key_ops" member which can represent all the WebCrypto key usages
(2) to add additional JWK algorithms for WebCrypto algorithms not covered
by JWK, specifically AES-CMAC, AES-CFB, HMAC-SHA-1, HMAC-SHA-224.
(3) to define mappings between WebCrypto and JWK
(4) to add myself as co-editor

...Mark