Port Olympic demo (FilterController)

[bshepherdson]

This is partly done, just adding this here for tracking purposes.

[bshepherdson]

• Sorting on table rows.
• Move to src/com/google/foam/demos
• Unroll the drop-down lists.
• Add aliases to properties and the query parser Add aliases back to properties #96
• Scale the scrollbar with code, not CSS.
• As the table gets filtered, we should constrain the scroll position to be inside the range that has data.
• Roll most of the functionality into FilterController, keep olympics.Controller minimal.

[bshepherdson]

All sub-tasks done. See PR #101.

[bshepherdson]

Merged! The vanilla version is at http://localhost:8000/src/com/google/foam/demos/olympics/index.html and the Polymer version at http://localhost:8000/src/com/google/foam/demos/olympics/polymer.html