Adds JSCS configuration file.

This change introduces a [JSCS](https://github.com/mdevils/node-jscs)
configuration file which allows us to lint the style of any changes
made to our scripts against the Google JavaScript style guide.

I’ve verified that app/main.js currently passes using the “google”
preset. At this time, I think we should only use the file along with an
editor plugin rather than introducing build-time tooling which may
bloat the Gulpfile.  This seems fine for everyday use.
Merge pull request #363 from google/jscsrc

Adds JSCS configuration file.
For #362 - adds section on WSK & CSS libraries.

This change adds a revised section on WSK vs CSS libraries based on
some content I wrote for the FAQs. I’ve run it through hemmingwayapp,
but if anyone has further feedback I’m happy to tackle this further.
Merge pull request #367 from google/overview

For #362 - adds section on WSK & CSS libraries.
bump deps
Link WSK Extras repository from the main readme file.

Fix for #365
Merge pull request #369 from crhym3/extras-repo-link

Link WSK Extras repository from the main readme file.
Simplified overview section of readme
Merge pull request #371 from Garbee/overview

Simplified overview section of readme
Update .jscsrc

update indent value of .jscsrc file and follow style rule.
Merge pull request #374 from antleblanc/master

Update .jscsrc
Fixes #375: sync recommendations (index > basic)
Improve index.html comments.
Merge pull request #377 from google/comments

Improve index.html comments. Fix #360
Rebase against master.