Update to the latest less.js

Review Request #6152 — Created July 27, 2014 and submitted — Latest diff uploaded

Information

Review Board
master
ddbf81c...

Reviewers

When running the devserver, I noticed that I wasn't getting retina icons
anywhere. The issue here is that the version of the less.js that we loaded when
running with DEBUG=True had a bug when importing mixins using (reference).
I've updated our shipped copy to the latest release (1.7.3) and it fixes the
issue.

Loaded a review request and the admin dashboard and saw retina icons
everywhere.

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