Rewrite for Polymer 0.8

[addyosmani]

0.8 introduces a more generic mechanism for filtering data. We should update to support it.

[skadimoolam]

@addyosmani, I have gone through the new docs but found very little about expression and nothing about filters.

It would be great if you could write an example filter, then I can port some of them.

[addyosmani]

See https://github.com/Polymer/polymer/blob/0.8-preview/PRIMER.md#template-repeater-x-repeat where we talk about the experimental x-repeat template option. It demonstrates how to author generic filters. I'll dig into whether there are best practices that can be defined for global filters like the old Polymer Expressions system supported.

[jay8t6]

can we do this for polymer 1.0?