Create fix for paths that contain spaces

Paths that contain spaces caused grunt-scss-lint to incorrectly report that all files are lint free.

This commit/pull request fixes that.

Also:
- Added tests for spaces in paths
- Made tests more sturdy
- Made tests compatible with latest version of scss-lint
- Incremented version number from 0.3.3 to 0.3.4
I understand that this is being thorough, but wouldn't this fail if results[0] is undefined regardless? I'm not sure we get anything extra out of this check, and it adds a little bit of extra friction to writing tests for new features.