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.

gdg-x / boomerang