Updated prettyprint.css to reflect latest library changes, remove additional style being added to code examples that caused overflow.
Fix additional mobile styles for the tutorial, prevent overflowing on mobile, fix word-wrap on the tutorial.
Fixing the appengine routing
Merge changes from Brian.
More minor mobile fixes to the menu, breadcrumbs, and pagination for the tutorial.
Spacing changes to the demo.
Images on ch02 of the tutorial updated not to include the drop shadow. Added in CSS instead.
Readability updates for tutorial/ch04
Replace inconsistent ellipses characters.