Update Gruntfile/package.json

Update Gruntfile with basic build process, this way we can remove
matchMedia polyfills and include external ones like media-match.
Prevent pixel-ratio/resolution media queries

Ref. https://github.com/pierreburel/Respond/commit/bbe272fe17c2a3e56e53c4f36ab9bf4e1c42fb01
Update version
Add dist files