reset changedVals array

changedVals was shared between multiple records, so if two different properties were changed on two different records, both would register as having both properties changed.

Author: ighvarma

src/igniteui-angular.js

@@ -69,6 +69,7 @@
 									diff.push({ index: key, txlog: changedVals });
 								}
 							}
+							changedVals = [];
 						}
 						if (dirty) {
 							return false;
@@ -668,4 +669,4 @@
 			module.directive(control, igniteElementDirectiveConstructor);
 		}
 	}
-}(angular, jQuery));
+}(angular, jQuery));