Added jscs for style checking

**Depends on #10**

PR #11 was inconsistent with the styles in the rest of the repo. By not having consistently styled code, contributors take longer to decide how to format their code and the overall readability of the repo suffers. I have decided to add `jscs` to mitigate the issue.

https://github.com/jscs-dev/node-jscs

In this PR:

- Added `grunt-jscs` and `.jscsrc`