Remove Safe Swiss Cloud as a known user (#71)

Removing Safe Swiss Cloud as a known user because they do not use Apache CloudStack anymore.
diff --git a/source/users.html.markdown b/source/users.html.markdown
index 2d33a47..a606e3b 100644
--- a/source/users.html.markdown
+++ b/source/users.html.markdown
@@ -210,7 +210,6 @@
 * RedBridge
 * RightScale, Inc.
 * Royal Melbourne Institute of Technology (RMIT)
-* Safe Swiss Cloud
 * SAP
 * Scalr
 * Schuberg Philis