Release 0.78.0 (Apr 8, 2016)

============================

* Don't force IPv6 if IPv6 nameservers supplied. Fixes #74.
* Call /bin/sh as users shell may not be POSIX compliant. Fixes #77.
* Use argparse for command line processing. Fixes #75.
* Remove useless --server option.
* Support multiple -s (subnet) options. Fixes #86.
* Make server parts work with old versions of Python. Fixes #81.
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