v1.1.0 - new jwt dependency

This release has a few breaking changes to the API as we're switching from the underlying jwt library github.com/dgrijalva/jwt-go to github.com/lestrrat-go/jwx. See #50 for further details + discussion.

Migration guide is pretty straight forward:

1. Use jwt.Token instead of *jwt.Token
2. Use tokenString from (*JWTAuth).Encode() instead of jwt.Raw
3. Use map[string]interface{} instead of jwt.MapClaims{}
4. Use jwtauth.New() instead of jwtauth.NewWithParser()

Please see _example and jwtauth_test.go for more details. As well to view more docs on the new jwt lib see https://github.com/lestrrat-go/jwx and https://github.com/lestrrat-go/jwx/blob/master/jwt/README.md

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NOTE: https://github.com/golang-cz/jwtauth is a fork of this repository without the above breaking changes. It uses github.com/golang-jwt/jwt, a successor to github.com/dgrijalva/jwt-go pkg, instead of the new github.com/lestrrat-go/jwx dependency.