typescript-backbone: Add routing

Fixes #1487

Fixes Long Task Overflow

spine: Fix the "mark all complete" checkbox

Fixes #795

sidebar links text fixes when framework + Require.js

ref #795

xref #1538 #1539

angularjs-perf: Fix the "mark all complete" checkbox

Ref #795

Ref #789

thorax: Cancel editing with the Escape key

knockoutjs_require: Cancel edits using Escape key

Ref #789

This roughly follows the pattern in examples/angularjs which already had the
ability to use Esc.

Ref #789

Design pattern and some code taken from examples/requirejs.

Fixed TypeScript+Angular example check all button functionality.

* Remove unused variables
* Simplify cached elements, IDs are unique
* Use chaining for event binding
* Use IDs directly, no benefit in caching
* DRY out the update logic
* Remove cacheElements since it's now named wrong

Update to polymer 1.2.3

Humble: Don't create new todos with empty titles. Fixes #1516.

This reverts commit 54107834.