Update Cesium to 1.15

gberaudo · gberaudo · commit 18aec6adeef4 · 2015-11-30T09:26:03.000+01:00
diff --git a/cesium b/cesium
@@ -1 +1 @@
-Subproject commit 33529f4191d1d50a7f318b118d6fb83b7c691910
+Subproject commit 75c1e8b6bdfc469ae43a9a19bde16e2c883496a0
