Add support for JS files.

[killfish]

I get this error: Warning: Cannot read property 'start' of undefined Use --force to continue. If I try to CDNify my JS files.

Here's my config.

files: [{
  expand: true,
  cwd: './.build',
  src: '**/*.{css,html,js}',
  dest: 'tmp'
}]

[XhmikosR]

Please make a complete test case in a repo so that we can try to reproduce.

[benjiwheeler]

What is currently expected behavior for this? Completely ignoring js file contents?

[adddz]

@callumlocke This is really needed :( I need to cdnify all the URLs inside a js file created by grunt (for angular.js). Please let us know if that's complicated.