openlayers/ol3 — pull request #1725 by tonio (2014-02-19 11:07:02+00:00)
Title: Enhance controls accessibility

This PR supersede #1708. It contains:

- A css refactoring to make controls share style.
- @mprins work on the zoom control
- An adaptation of @mprins work for zoomToExtent & Fullscreen controls
- A visual refresh for controls tips
- moving from px to em based sizing/positioning for controls.

Please review

![capture decran 2014-02-19 a 12 04 43](https://f.cloud.github.com/assets/21686/2205774/d01a9aba-9955-11e3-9557-3d14335e077c.png)