Better Error Logging

[ghost]

I think this repo is a great idea, I implemented it in our code base and ran into an error

source/javascripts/modules/add-button.js (1 module)
Unused paths: jquery.mobile
Unused dependencies: __mobile

Warning: Line 56: Unexpected token < Use --force to continue.

Aborted due to warnings.

Which tells me nothing about the file that it failed on to go fix the file it is having trouble parsing.

Would be good to have better error logging.