JSHint: Upgrade from v1.1.0 to v2.1.11

Announcements for the notable releases this upgrade covers:
* v2.0.0: http://jshint.com/blog/2013-05-07/2-0-0/
* v2.1.0: http://jshint.com/blog/2013-05-20/2-1-0/
* v2.1.6: http://jshint.com/blog/2013-07-28/2-1-6/
* v2.1.10: http://jshint.com/blog/2013-08-15/release/

Bug: 48977
Change-Id: I0f79168b5cede6266823abfe31f3e0e4f6bebd1b