Merge https://github.com/less/less.js into rhino
Merge https://github.com/less/less.js into rhino
Fix interpolated import into media #1645

Media objects do not have ruleset property. They have rules property which
always contains one-member array with fake ruleset in it.
Merge pull request #2123 from SomMeri/import-into-media-1645

Import into media 1645