Add new .jshintrc file and enable strict mode all JS files

[starcalibre]

Add new .jshintrc file and enable strict mode all JS files

This PR adds a stricter .jshintrc file based on the Airbnb JS style guide with a few small changes.

• Strict mode is enabled for all JS files, and will now be enforced by JSHint. Strict mode prevents whoopsies that usually fail silently in JS such as using undeclared variabled and using duplicate property names in functions.
• The stricter .jshintrc file caught a few things like missing semi-colons, lines longer than 80 characters, etc. Pretty much all of the changes here are fixing minor things like that.
• Newest versions of the grunt plugins for JSHint and Karma are being used now, mostly so I could run JSHint over the test spec files.

[jni]

@starcalibre I like it! Linters are just amazing. =)