PSA: 2013-08-15 updates

[Eric Bidelman]

2013-08-15 release notes

Polymer core docs:

• Ways to register a <polymer-element>
• Defining static/private variables in an element
• Updated lifecycle methods per spec changes
• Polymer Expressions supported in Template Binding

New platform prollyfill specs:

• Template Instances
• Node.bind()

For reference, there's also a stub README on the observe-js library.

Eric