Render document URLs with the already defined Document.get_absolute_url method instead of inline.
fix bug #1002371 - don't lose the query parameters when switching languages.
Fix bug 1008828: Show correct locale/slug in page move error.

The root of the problem was a child page move failing after the
child's locale/slug had already been changed in-memory; in that case
the new locale/slug would end up in the error message instead of the
original.

Now the original locale/slug get stashed away prior to attempting the
child move, and if the child move fails they get inserted in the error
message to ensure the error points to the correct URL.
Use latest kuma-lib to fix an issue with Django and hash_ring.
Also install newest version of Django on Travis.
Remove all compat-* functions in Stylus

The compat-* functions were used to override styles from the old design.
The functions used !important to do this. By removing the functions and
the associated use of !important, our stylesheets will be more
maintainable and reliable. This also reduces the size of compiled CSS by
2.04KB.

Some bugs were fixed just by removing these functions. At the same time,
some bugs were revealed by removing these functions. (For example,
errors related to selector specificity suddenly manifested as
user-facing bugs when !important was removed.)

Newly-manifesting bugs like these were searched for and corrected, but
it is possible that some remain. If we find any more, we can correct
them with later commits.
Merge pull request #2389 from ubernostrum/page-move-error-1002040

Fix bug 1008828: Show correct locale/slug in page move error.
Merge pull request #2401 from openjck/remove-compat

Remove all compat-* functions in Stylus
Use placeholder selectors wherever possible

The classes .review-base and .dev-program-pad have been updated to
placeholder selectors because, although they are extended, they do not
appear in markup. This saves 62 bytes of compiled CSS.
Reverting quick links change to they work with icons
Merge pull request #2404 from darkwing/quick-links-icons

Reverting quick links change to they work with icons
Merge pull request #2385 from jezdez/document-url-rendering

Render document URLs with the already defined Document.get_absolute_url method
Merge pull request #2386 from jezdez/language-switcher

fix bug #1002371 - don't lose the query parameters when switching languages.
Ensure search top has proper background
Merge pull request #2405 from darkwing/search-background

Ensure search top has proper background
fix bug 865863 - remove duplicated styles
Massive minification of all media-dir images
Merge pull request #2400 from jezdez/update-django

Updated some deps.
Merge pull request #2409 from darkwing/optimize-images-again

Massive minification of all media-dir images
Merge pull request #2403 from openjck/use-placeholder-selectors

Use placeholder selectors wherever possible