2.0-wip: progress-bars.less has compile errors

Created by: lookfirst

I'm getting this, not sure why. It seems the error message isn't super helpful. I'm using npm installed lessc v 1.1.6.

Syntax Error on line 21 in /bootstrap/progress-bars.less
20 // Spec
21 @keyframes progress-bar-stripes {
22   from  { background-position: 0 0; }[0m