Ssh2-python

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Changes
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* Implemented `last_errno` and `set_last_error` session functions
* Agent authentication errors raise exceptions
* C-API refactor
* SFTP IO errors raise exceptions

Fixes
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* Crash on de-allocation of channel in certain cases
* SFTP ``readdir_ex`` directory listing (long entry) was not returned correctly

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Changes
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* Accept both bytes and unicode parameters in authentication with public key from memory.

Fixes
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* Unicode -> bytes parameter conversion would fail in some cases.

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Fixes
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* Agent authentication thread safety.

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Changes
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* Win32 build compatibility.
* Binary wheels for Linux, OSX and Windows, all Python versions, with embedded libssh2 and OpenSSL (embedded OpenSSL is Linux and OSX only).
* OSX CI builds.

Fixes
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* Session initialisation thread safety.
* Agent thread safety.

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No code changes.

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Changes
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* Implemented public key subsystem for public key management on remote servers
* Added all libssh2 error codes to ``ssh2.error_codes``