JWK Refactor

[mpdavis]

This is the beginning of a refactor of JWK objects so that can begin their journey to not being horrible. I am hoping that JWKs can be a first class object just like JWS and JWT are.

Still TODO:

• process HMACKey JWKs
• process ECKey JWKs
• correctly process RSAKey JWKs to include private keys
• to_jwk method to serialize Keys to a JWK dict
• JWK documentation

The old way:

alg_obj = get_algorithm_object(algorithm)
key = alg_obj.prepare_key(key)
signature = alg_obj.sign(signing_input, key)

The new way:

key = jwk.construct(key_data, algorithm)
signature = key.sign(signing_input)

@crgk You input would be appreciated if you were interested.

[crgk]

is this method meant to be used directly? I don't see how somebody would want/need to call this on an instance of RSAKey, since you have to prepare a key to get an instance.

Making it _process_jwk would indicate that it is an implementation detail more than an API, if that's your intent

[codecov-io]

Current coverage is 95.37%

Merging #17 into master will decrease coverage by 0.18%

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- Misses           19         21     +2   
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