OL3-Cesium v1.16

Release 1.16 based on OL 3.16.0 and Cesium 1.21. See CHANGES.md.
Add support for drawing Cesium rectangles and going through a proxy.

OL3-Cesium v1.15

Release 1.15 based on OL 3.15.1 and Cesium 1.20. See CHANGES.md.
The way pixel ratio was handled changed in this version and is based on the work done by Cesium.

OL3-Cesium v1.14

Release 1.14 based on OL 3.14.2 and Cesium 1.19. See CHANGES.md.

OL3-Cesium v1.13

Release 1.13 based on OL 3.14.0 and Cesium 1.18. See CHANGES.md.

OL3-Cesium v1.12

Release 1.12 based on OL 3.13.0 and Cesium 1.17. See CHANGES.md.
Removed dragbox functionnality which depended on code dropped from Cesium in this version.

OL3-Cesium v1.11

Release 1.11 based on OL 3.12.1 and Cesium 1.16. See CHANGES.md.

OL3-Cesium v1.10

Release 1.10 based on OL 3.11.2 and Cesium 1.15. See CHANGES.md.
OL3-Cesium is now built together with OL3, see #289.

OL3-Cesium v1.9

Release 1.9 based on OL 3.10.1 and Cesium 1.14. See CHANGES.md.

OL3-Cesium v1.8

Release 1.8 based on OL 3.9.0 and Cesium 1.13. See CHANGES.md.

OL3-Cesium v1.7

Release 1.7 based on OL 3.8.1 and Cesium 1.12. See CHANGES.md.