Fixed that in some situations a mixin call into a referenced file wouldn't import media queries. Fixes #1469
Fix a small scope issue with mixins when using parent selectors, introduced in 1.6.2. Fixes #1877
when in lint mode, report errors from creating css. Fixes #1786
Do not evaluate css with guards if the guards fail. Fixes #1873
Merge branch 'master' of https://github.com/cloudhead/less.js