[reviewboard] Update to the latest version of django-pipeline.

Review Request #4751 — Created Oct. 14, 2013 and submitted — Latest diff uploaded

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Review Board
master

Reviewers

Update to the latest version of django-pipeline.

Now that django-pipeline has an explicit setting for enabling/disabling
media pipelining, and now that we're using Django 1.5, we can make use
of it again. This upgrades us to the latest release of pipeline.

Tested with a development setup and a production install.

Building packages worked.