Polymer/core-list — pull request #4 by pdf (2014-07-07 18:48:36+00:00)
Title: Implement grid layout.

Activate via the `grid` boolean attribute. Requires specifying item width in addition to item height.

This PR also fixes a couple of minor bugs and implements basic resize support (window resize only, no element size tracking). I can split these out if you'd prefer not to take them as part of this request.