Add tools/cake submodule.

lewissbaker · lewissbaker · commit e6560707c85e · 2017-03-21T21:18:37.000+10:00
diff --git a/tools/cake b/tools/cake
@@ -0,0 +1 @@
+Subproject commit d552f87a874eda6f0638e508655e99fe586bb35b
