Release version 0.76

Release 0.75 (Jan 12, 2016)

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* Revert change that broke sshuttle entry point.

Release 0.74 (Jan 10, 2016)

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* Add CHANGES.rst file.
* Numerous bug fixes.
* Python 3.5 fixes.
* PF fixes, especially for BSD.

New version 0.73

Has significant changes. Such as:

* Now has setup.py for inclusion in PyPI.
* Firewall methods are abstracted out from main code.

Shuttle 0.72

Bug fixes, mostly for OS-X.
Fixes for Debian packaging issues.

Fix UDP channel expiration.

sshuttle.md: fix whitespace issues.