Remove deprecated JSCS rules

Document #13863

Switch to uber/npm-shrinkwrap for npm-shrinkwrap.json generation

Instead of our homegrown grunt/shrinkwrap.js
Fixes #13483.
New npm-shrinkwrap.json is human-readable but still in a consistent/stable format.
Should aid debugging, produce better diffs, and be less prone to merge conflicts

Fix @gray-light in docs

Always use preserveComment: 'some'

Use full deprecation version

Make striped progress bars its own class

Change skew(x,y) to skewX skewY

Add a variable for .dl-horizontal's offset