Update README.md
Update README.md
Add correct token rendering and failure response when using bearer tokens.

According to the RFC7650 specification, when a protected resource does not have
a valid token (or a missing token), the server should respond with a
WWW-Authenticate header.

When issuing a token to a client (upon successful authentication), the token's
format should match that which is defined in RFC6750 as well.

This resolves the remaining issues mentioned in #73.
Update README.md
Update tests to support new token JSON output format.

When refactoring the DefaultRestAuthenticationTokenJsonRenderer, a change was
made to the order in which fields are populated, resulting in the token always
being last.
Merge branch 'develop' of github.com:alvarosanchez/grails-spring-security-rest into develop
Merge pull request #73 from ajbrown/bearer-token-support

Add support for RFC6750 Bearer Tokens.
Merge branch 'develop' of github.com:alvarosanchez/grails-spring-security-rest into develop