Update from upstream

This PR updates our version of ol3 to the upstream version https://github.com/openlayers/ol3/commit/be7ee49701b34fc90ceff2cea6c39869f9836cf5 (some commits after official 3.0.0 release.

Quite a few adaptions were needed to get the build working. See https://github.com/geoadmin/ol3/commit/904b542d422cfcd1c1ca1f6618315ad57871f402. We also created an ol.View2D alieas in order to be compatible with existing API implementations.

One remaing problem: the tests are not working because of the missing GeoAdmin global. But I'm not sure if they worked before. @oterral can you verify?

I will create a PR in mf-chsdi3 which will integrate these changes.