Refs #238

3.7 is not available for trusty.

* When finding last update, ignore refs that point at missing objects.

* Don't break when sorting refs where some refs point at non-existing
objects.

Try a bit harder to come up with sensible names for tarballs and prefixes in tarballs.

table and img should look the same in index view and blobview

If readme files contain markup, they weren't displayed correctly in the
index view (no padding, no grey box).

The fix contains two changes:
- Use `force_unicode` on the readme's filename
- use the CSS properties for both blobview and non-blobview

use https for screenshot URLs

Properly keep track of exception so it can be reraised in force_unicode.

Recognize more Markdown file extensions for READMEs.

Ship klaus.1 manpage.

Put files in a tarball in a subdirectory.

Fixes #204

Set report_level to an integer.

See http://docutils.sourceforge.net/docs/user/config.html#report-level

the low lovel stuff is now in wsgi_autoreloading so it can easily
imported into a mod_wsgi loader script without invoking the
wsgi_autoreload top level code

Fixes #144 - Blank Git user config for tests

removed the '--no-gpg-sign' from PR #141 and overrites the HOME variable to
force git using an empty config.

see changes in:
 * tests/repos/scripts/dont-render
 * tests/repos/scripts/no-newline-at-end-of-file
 * tests/repos/scripts/test_repo