Updating to less.js 1.7.4
Merge branch 'master' into gh-pages

* master:
  Updating to less.js 1.7.4
Merge remote-tracking branch 'upstream/gh-pages' into gh-pages

* upstream/gh-pages:
  Updating to less.js 1.7.4
Merge remote-tracking branch 'upstream/gh-pages' into gh-pages

* upstream/gh-pages:
  Updating to less.js 1.7.4