Merge pull request #770 from am11/master

CSS: Drag-drop causing @import in web apps (#486)
CSS: Removed features that is graduating

These features will be in Update 2
JS: Added Angular.js Intellisense
CSS: Removed !important Intellisense

Is being rolled into Update 2
JS: Added Intellisense for the HTML Import spec

http://www.w3.org/TR/html-imports/