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/toBeCloseTo.js

@@ -1,14 +1,16 @@
 getJasmineRequireObj().toBeCloseTo = function() {
 
   function toBeCloseTo() {
-    return function(actual, expected, precision) {
-      if (precision !== 0) {
-        precision = precision || 2;
-      }
+    return {
+      compare: function(actual, expected, precision) {
+        if (precision !== 0) {
+          precision = precision || 2;
+        }
 
-      return {
-        pass: Math.abs(expected - actual) < (Math.pow(10, -precision) / 2)
-      };
+        return {
+          pass: Math.abs(expected - actual) < (Math.pow(10, -precision) / 2)
+        };
+      }
     };
   }