1.5.0:
* Added the `mic_present` property to the `NtlmContext` class to determine if a MIC has been added to the authentication message.
* Added the `sign` and `verify` function to the `NtlmContext` to sign data and verify signatures.
* Added the `reset_rc4_state` function to the `NtlmContext` to allow a caller to reset the incoming and outgoing RC4 cipher.
* Added the `NTLMSSP_NEGOTIATE_UNICODE` flag to the negotiate message to ensure the challenge and authentication message's text fields can be unicode encoded
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