Update ngprogress-lite.js
Update ngprogress-lite.js

When using it for asynchronous chained calls, there's a case when calling done() multiple times (for instance start(),start(),done(),done())

This resulted in progressbar hiding instead of moving to the end. Added check for this.
sangramsam/ngprogress-lite,voronianski/ngprogress-lite,sangramsam/ngprogress-lite