@import directives should work even if the .less file extension is not present.

see http://lesscss.org/features/#import-directives-feature-file-extensions:
"If it does not have an extension, .less will be appended and it will be included as a imported Less file."

Replaces #23
Merge pull request #39 from s7eph4n/fix-import

@import directives should work even if the .less file extension is not present