Because of the previously-hardcoded "_public/js/dontUseMe" path, it wasn't possible to use the plugin with a different Brunch "public" path.

Fixes the issue by replacing the "_public" string, part of the hardcoded path, with the config.path.public paramater, from the Brunch config file.
Merge pull request #7 from ghinda/custom-public-fix

Fix issues with using a different/custom path for the public folder