ENYO-2465: add quotes to the key names for addPath calls generated by minifier to handle cases where filenames aren't valid JS identifiers

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Merge pull request #295 from enyojs/ENYO-2465-unwiredben

ENYO-2465: add quotes to the key names for addPath calls generated by mi...

Reviewed-By: Gray Norton <gray.norton@lge.com>