[bug 855621] Setup infrastructure for sending HTML emails
Cleanup and consistency-ify
[bug 851182] Discard print.macosx.pagesetup and print.macosx.pagesetup-2

This troubleshooting info is long and useless.
[Bug 839618] Add contribution info to KB credits.
Minor tweaks to previous commit.
updated the 'Take the Bug' doc section. Make clear that you need special perms to see the 'take' link.
[bug 859361] Display article category on article history page
Change to unminified version of rickshaw.js.
[Bug 857153] Add data bucketing to rickshaw_utils.

This gives the ability to reduce time regions in buckets to make things
a little cleaner to analyze on the large scale. The reduction method
defaults to simple sum, but can be configured to average for things like
percentage lines. The hover tips have been modified to agree with this.

There are also tweaks to the set and line system to make this all work
together, and there is a very useful update method on Graphs now which
redraws the graph in a pretty reliable way.
Minefield doesnt exist anymore.
[bug 850785] Use firefox version in troubleshooting info when available.
Remove no longer used styles.
[bug 854898] Add a js confirm dialog to user deactivation form.
[bug 854898] Allow youtube embeds in the forums.

Moved the video hook from wiki.parser to the parent sumo.parser and
added tests.
Change user_or_ip key generator to take a prefix.
Cleanup unused imports.
[bug 855618] Rate limit document votes to 10 per day.
[bug 785851] Rate limit the number of answers to 1 per minute.
[Bug 641503] What links to this?

At render time, record the network of links in the KB, and add a view to
show them. This includes Template usage.