Stick to jscs 1.6.x

1.7.x crashes on our code.
https://github.com/jscs-dev/node-jscs/issues/684

It is merged, but still not released, so we'll use 1.6 for now.
Support for source maps in coverage reports
Add sourceRoot option
Read css/map content from server and from file system if failed;
Better report details
Check that source map returned valid mapping
Read source map url from pragma in the source css file
Resolve sourceRoot relative to projectRoot
codestyle
Cosmetic report changes
The order of covered/total, percentage changed to percentage (covered/total)
Added summary stats to the coverage index page