JWK Updates

[EternalDeiwos]

• Made JWKSet.find and JWKSet.filter synchronous.
• Use sift queries for find and filter object predicates.
• JWKSet.publicJwks getter for publishing /jwks endpoint.

[codecov]

Codecov Report

Merging #2 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master     #2   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           6      6           
  Lines         154    156    +2     
  Branches       26     25    -1     
=====================================
+ Hits          154    156    +2

Impacted Files	Coverage Δ
src/JWK.js	100% <100%> (ø)	⬆️
src/JWKSet.js	100% <100%> (ø)	⬆️

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[EternalDeiwos]

• use nock for url importKey testing
• generate kid's for keys generated using JWKSet

[christiansmith]

Excellent, thanks!