Major updates to merge in from the boomerang-gae project

* Added some SEO improvements like hashbang addressing, meta description, descriptive h1 text on each page, and image alt properties.
* Added ng-cloak to body to try to avoid double mustaches showing up when rending page.
* Added instructions to README for testing locally with node.js' http-server.
* Added helpful error message when request for Picasa Web Album API fails.
* Updated promo to Google I/O.
* Increased from 10 to 20 news items and added a much more complete implementation of the News controller.
* Increased Photos displayed from 20 to 50.
* Added sponsor images to About page.
* Moved scripts after body for performance.
* Added .gitignore file.
* Deleted IntelliJ config file.