fixed imports bug
Updated less dependency to version 1.4
Add extension to filename unless it ends with .(less|css) .
Changed LESS-version requirement to "~1.4" (= ">=1.4.0 <1.5.0").
Merge pull request #43 from AmoebaConsulting/master

Fixed import errors occurring with LESS v1.4 and updated LESS-dependency version in package.json