Update Less to 1.4.1
Merge branch 'master' into less-upgrade
Fixed a few issues with strict math mode
Merged with master
Update to less 1.4.2 and fix unit tests and use url()
Merged with master
Merge remote-tracking branch 'origin/master' into less-upgrade
Fix unit test failure
change gruntfile
Merge pull request #4476 from WebsiteDeveloper/less-upgrade

[OPEN] Update Less to 1.4.2