Get rid of goog.functions

src/ol/functions.js

@@ -0,0 +1,17 @@
+goog.provide('ol.functions');
+
+/**
+ * Always returns true.
+ * @returns {boolean} true.
+ */
+ol.functions.TRUE = function() {
+  return true;
+};
+
+/**
+ * Always returns false.
+ * @returns {boolean} false.
+ */
+ol.functions.FALSE = function() {
+  return false;
+};