chore(Grunt) update grunt-contrib-copy

grunt-contrib-copy@0.4.1 has the cleaner summary output by default
fix(ngRepeat): prevent initial duplicates
fix(ngdocs): improve the animations used in the docs menu
fix(ngAnimate): prevent animation on initial page load
fix:(animator): Correctly handle multiple durations

In case multiple durations are specified like so:

 transition-duration: 0.5s, 3000ms;
 transition-property: left, height;

The animator will pick the longest duration.

Fixes #2373