Get rid of unnecessary references.
Fully implement token behaviors, Tokenize and IsValid.
Add interface methods with strings in and out.
Return HMAC as a string.
Add MessageAuthenticationService.  Implement the CreateHmac service method.
Add reference to the Cryptography project.
Register IMessageAuthenticationService as a singleton.  We want to generate a new key once each time the WebAPI app starts.
Implement GenerateToken service method up to the point of Encryption.