Avoid including the '/**' comment from WikimediaUI Base in our output
Avoid including the '/**' comment from WikimediaUI Base in our output

Use Less "reference" import to avoid including the '/**' comment from
WikimediaUI Base.

http://lesscss.org/features/#import-atrules-feature-reference

Previously we had the below comment duplicated in several places in
our distribution files:

/**
 * WikimediaUI Base v0.11.0
 * Wikimedia Foundation user interface base variables
 */

Change-Id: I9b24ff5323343c36f52e0863963c7c0d9212b409

wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui