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

spec/core/matchers/toBeGreaterThanSpec.js

@@ -1,19 +1,19 @@
 describe("toBeGreaterThan", function() {
   it("passes when actual > expected", function() {
-    var matcherComparator = j$.matchers.toBeGreaterThan(),
+    var matcher = j$.matchers.toBeGreaterThan(),
       result;
 
-    result = matcherComparator(2, 1);
+    result = matcher.compare(2, 1);
     expect(result.pass).toBe(true);
   });
 
   it("fails when actual <= expected", function() {
-    var matcherComparator = j$.matchers.toBeGreaterThan();
+    var matcher = j$.matchers.toBeGreaterThan();
 
-    result = matcherComparator(1, 1);
+    result = matcher.compare(1, 1);
     expect(result.pass).toBe(false);
 
-    result = matcherComparator(1, 2);
+    result = matcher.compare(1, 2);
     expect(result.pass).toBe(false);
   });
 });