Updating to latest ol3 version

This PR updates ol3 to latest master version: https://github.com/openlayers/ol3/commit/7b7070d72334756fcc171347938c52a9ff1dc7e2

It's in preparation for the kml import component, which needs the latest ol3. I will base the kml work on this branch.

1. Proj4Js version needed to be changed to 2.2.x because of https://github.com/openlayers/ol3/pull/1228. ~~Note that **this change resulted in different transformation results than the older version**. This can be seen in the tests, which needed to be adapted.~~
2. MGRS.js has been removed as proj3js 2.2.x now supports it out of the box.
3. View2D does not exist anymore

Please don't merge yet.

Known issues:
a) ~~Print does not work~~
b) ~~Strange ol3 logo in attribution corner~~