Klaus

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- SECURITY ISSUE, PLEASE UPDATE: Fix 200: Missing HTML escaping in diff view
- 189: Submodule info page instead of server error (Jelmer Vernooij)
- 187, 191, 165: Bug fixes (Chris St. Pierre, Aleksey Rybalkin)

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* 177: Fix relative links in READMEs (etc.) (Jelmer Vernooij)
* 36: Allow for branch names with ``/``, e.g. ``feature/foobar`` (Martin Zimmermann, Chris St. Pierre)
* 184: Drop support for Python 2.6 (Jelmer Vernooij)
* Refactor diff generating code (Jelmer Vernooij)
* Fix temporary files not being deleted (Jonas Haag)

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* Display README on repository landing page (Jelmer Vernooij)
* Make all options configurable using environment variables (Jimmy Petersson)
* 122: Support `.git/cloneurl` and `gitweb.url` settings (Jelmer Vernooij)
* Support ".mdwn" markdown file extension (Jelmer Vernooij)
* 166: Set device viewport (Jonas Haag)
* Fix autoreloader with Python (Jimmy Petersson)
* 169: Fix htdigest with autoreloader (Jimmy Petersson)

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* Full support for Python 3 (Louis Sautier, Jonas Haag)

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* 155: Do not change SCRIPT_NAME if HTTP_X_SCRIPT_NAME isn't set (Louis Sautier)

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* 140, 145: Deprecate ``klaus.utils.SubUri`` in favor of the new ``klaus.utils.ProxyFix``,
which correctly handles ``SCRIPT_NAME``. For details on how to use the new ``ProxyFix``,
see `Klaus behind a reverse proxy <https://github.com/jonashaag/klaus/wiki/Klaus-behind-a-reverse-proxy>`_.
(Jelmer Vernooij, Jonas Haag)
* Add man page. (Jelmer Vernooij)
* Add ``--version`` command line option (Jelmer Vernooij)
* Improve error message when ctags is enabled but not installed (Jonas Haag)
* Add a few missing entries to the default robots.txt (Jonas Haag)