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
@meinaart Good points, now that I'm thinking about it I remember thinking those errors were terrible.

:+1: