chore(jenkins): disable unit testing on Safari

There is a strange failure in the animation code that only appears to happen
on Safari 10 on OS/X. While we investigate we are disabling this browser
to allow the development (and doc generation) to continue.

scripts/jenkins/build.sh

@@ -12,7 +12,7 @@ set -xe
 # This is the default set of browsers to use on the CI server unless overridden via env variable
 if [[ -z "$BROWSERS" ]]
 then
-  BROWSERS="Chrome,Firefox,/Users/jenkins/bin/safari.sh"
+  BROWSERS="Chrome,Firefox"
 fi
 
 # CLEAN #