initial commit of JWT library
implement special single audience claim
force encoding of IntDate as JSON integer
add createJWT function
implement token decoding and validation

Also address some hlint complaints.
chase repo rename jwt -> hs-jwt
chase Key -> JWK rename and define JWT exports
instance FromCompact JWT and remove decodeJWT
wrap JOSE URI instead of Network.URI.URI

Avoid duplicating URI FromJSON/ToJSON logic and use the URI newtype
from JOSE instead of Network.URI.URI.
instance FromCompact and ToCompact
chase JWS API change
update to aeson 0.7
move source code to src/
depend on jose 0.1.26
chase jose api changes
chase jose api changes (JWSHeader, prelude module)
haddock all the things
merge hs-jwt library into hs-jose