Require the latest Django 1.4.11 security release.

This fixes a number of security issues. Most importantly to us, a bug in
reverse() that could lead to importing unexpected modules, if the
attacker knows which modules are on the server.

See https://www.djangoproject.com/weblog/2014/apr/21/security/
Release Review Board 1.7.25.
Merge branch 'release-1.7.x' into release-2.0.x
Fix using the wrong directive in the 1.7.25 release notes.

This was using :cmd:, which should have been :command:.
Merge branch 'release-1.7.x' into release-2.0.x
Improve the style of generated e-mails.

E-mails were a bit ugly. (They still are with this change, but less so.)

The border of the review request boxes was pure black, which was a bit
heavy. It was also very boxy.

I've made the colors match what we have in Review Board, and added some
border radiuses (for clients that support it) to all the main boxes.

I've also fixed up the style for the "Review request closed" bar, which
was too large, due to default styles for the <h1>.

Reviewed at https://reviews.reviewboard.org/r/5720/
Replace the non-standard Event 'srcElement' property with the standard 'target' one

Event.srcElement is IE-specific and isn't supported in Firefox.

Testing Done:
I confirmed the following now work in Firefox:
* Issue column sorting
* Switching image diff modes
* The issue automatically expands when you click one from the issue summary

Reviewed at https://reviews.reviewboard.org/r/5703/