Httpsig-cffi

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* Move from PyCrypto to Cryptography.
* Move to py.test.


httpsig (previous)
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* Changed "(request-line)" to "(request-target)" to comply with Draft 3.

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* Unified the default signing algo under one setting. Setting httpsig.sign.DEFAULT_SIGN_ALGORITHM changes it for all future instances.
* Handle invalid params a little better.

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* Ensure we treat headers as ASCII strings.
* Handle a case in the authorization header where there's garbage (non-keypairs) after the method name.

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* Python 3 support (2.7 + 3.2-3.4)
* Updated tox and Travis CI configs to test the supported Python versions.
* Updated README.

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* Written against http://tools.ietf.org/html/draft-cavage-http-signatures-02
* Added "setup.py test" and tox support.
* Added sign/verify unit tests for all currently-supported algorithms.
* HeaderSigner and HeaderVerifier now share the same message-building logic.
* The HTTP method in the message is now properly lower-case.
* Resolved unit test failures.
* Updated Verifier and HeaderVerifier to handle verifying both RSA and HMAC sigs.
* Updated versioneer.
* Updated contact/author info.
* Removed stray keypair in test dir.
* Removed SSH agent support.
* Removed suport for reading keyfiles from disk as this is a huge security hole if this is used in a server framework like drf-httpsig.