Revert removal of compare nesting

Since we want the user to be able to pass a negative comparison function, the extra layer of wrapping is now needed

src/core/matchers/toBeLessThan.js

@@ -1,11 +1,14 @@
 getJasmineRequireObj().toBeLessThan = function() {
   function toBeLessThan() {
-    return function(actual, expected) {
-      return {
-        pass: actual < expected
-      };
+    return {
+
+      compare: function(actual, expected) {
+        return {
+          pass: actual < expected
+        };
+      }
     };
   }
 
   return toBeLessThan;
-};
+};