Pywebdav3

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Include tests dir in release pack to unblock debian packaging tests.

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Fix responed data type error
Fix exception when trying to list directory over WebDAV
Don't send Content-Type header twice
Fix python2 support
Don't decode binary data on put

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Allow running davserver as PyWebDAV server

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Added unit test to run litmus webdav testing suite.
Added travis-ci job to run said test, but it has false positives. Runs locally correctly.
Fixed a number of unicode issues from the python3 translation identified by the unit test.
Still a number of litmus tests failing to do with props and file locking.

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The original package name PyWebDAV was being referenced in lib, causing the server to fail
No other change in functionality
[Andrew Leech]

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Updated to support Python 3.
No other change in functionality
[Andrew Leech]