jshint warnings

[dduugg]

jshintrc should be named .jshintrc. With that change, jshint will generate the following warnings:

$ jshint src/js/pebble-js-app.js
src/js/pebble-js-app.js: line 200, col 18, 'MessageQueue' was used before it was defined.
src/js/pebble-js-app.js: line 11, col 23, 'window' is not defined.
src/js/pebble-js-app.js: line 51, col 17, 'clearTimeout' is not defined.
src/js/pebble-js-app.js: line 273, col 25, 'toString' is not defined.
src/js/pebble-js-app.js: line 296, col 21, 'clearTimeout' is not defined.
src/js/pebble-js-app.js: line 307, col 21, 'clearTimeout' is not defined.
src/js/pebble-js-app.js: line 358, col 25, 'window' is not defined.

7 errors

Happy to submit a PR to resolve the above. I can also include a Travis configuration to catch future warnings.

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