Refactored AuthenticationChallenge.cs
Refactored AuthenticationResponse.cs
Refactored HttpBasicIdentity.cs
Refactored HttpDigestIdentity.cs
Fix a few for HttpBasicIdentity.cs
Renamed ParseBasicAuthResponseParams to ParseBasicCredentials
Renamed Params to Parameters
Refactored AuthenticationChallenge.cs and AuthenticationResponse.cs
Moved AuthenticationChallenge under the WebSocketSharp.Net namespace
Moved AuthenticationResponse under the WebSocketSharp.Net namespace
Added AuthenticationBase.cs
Moved some properties to AuthenticationBase class
Modified ToDigestString method
Moved overridden ToString method to AuthenticationBase class
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