Fix js error when diffing empty strings.
[bug 807448] Upgrade python-memcached to v1.48.
[bug 808069] Add lazyload script to mobile.
bug 805793 - Syntax highlighting for the knowledge base editor
[Bug 801584] Store expanded state of sidebar.

Use local storage to store the state of the editing and contributor
tools being expanded or contracted in the sidebar when viewing
documents.
[Bug 808836] Don't break edit links.

This fixes an over zealous selector in the localstorage saving of
expanding side menus.
Fix editor js error when ace isnt used.
[bug 804139] Restyle survey on wiki
s/import datetime/from datetime import datetime, timedelta/
[bug 768242] Limit question age to 180 days in default search results.
[Bug 809187] Add Google Analytics tracking code.

This adds the GA code in an external file, which is not what Google's
instructions say, but it should work anyways.
[Bug 633136] Show diffs and summaries in emails.

In emails that go out when people edit, review, and reqeust review on
documents, show diffs and summaries, to better match how tikiwiki did it
back in the day.

Also make the emails consistent, and make all of the tests related to
these emails more consistent.
[bug 800420] Redirect /an/ to /es/.
[bug 790789][bug 790794] Improve translate page.

* No sidebar.
* Make page width fluid to allow full use of window width.
* Add "Toggle diff" for toggling between en-US content and diff
  next to the editor.
Move showfor on review page to the left.
[bug 803588] Absolute dates for question
Only disable forms on POST.

Fixes caching (lack of) on GETs like when searching.
[Bug 809433] Add registration surveygizmo.

In doing this, I noticed that the other surveygizmo on the site was
powered by waffle, and had a comment saying that it should probably be
in another file. I moved the old surveygizmo, and this new on, to an
external file controlled by a data attribute on <body>.

Also added a migration (177) to add the waffle flag used.
[bug 799946] Show number of votes this week for questions
Fix js tests.