perf(jqLite): expose the low-level jqLite.data/removeData calls

- updated the internal jqLite helpers to use the low-level jqLite.data/removeData to avoid unnecessary jq wrappers and loops
- updated $compile to use the low-level jqLite.data/removeData to avoid unnecessary jq wrappers at link time

test/jqLiteSpec.js

@@ -386,6 +386,7 @@ describe('jqLite', function() {
       selected.removeData('prop2');
     });
 
+
     it('should add and remove data on SVGs', function() {
       var svg = jqLite('<svg><rect></rect></svg>');
 
@@ -415,6 +416,27 @@ describe('jqLite', function() {
     });
 
 
+    it('should provide the non-wrapped data calls', function() {
+      var node = document.createElement('div');
+
+      expect(jqLite.data(node, "foo")).toBeUndefined();
+
+      jqLite.data(node, "foo", "bar");
+
+      expect(jqLite.data(node, "foo")).toBe("bar");
+      expect(jqLite(node).data("foo")).toBe("bar");
+
+      expect(jqLite.data(node)).toBe(jqLite(node).data());
+
+      jqLite.removeData(node, "foo");
+      expect(jqLite.data(node, "foo")).toBeUndefined();
+
+      jqLite.data(node, "bar", "baz");
+      jqLite.removeData(node);
+      jqLite.removeData(node);
+      expect(jqLite.data(node, "bar")).toBeUndefined();
+    });
+
     it('should emit $destroy event if element removed via remove()', function() {
       var log = '';
       var element = jqLite(a);