Make NativeMML output properly handle iOS double-tap-and-hold, and issue warning message when switching to NativeMML output. Resolves issue #209.

unpacked/extensions/MathMenu.js

@@ -805,8 +805,11 @@
       Opera:   "Opera's support for MathML is limited, so switching to " +
                "MathML output may cause some expressions to render poorly.",
 
+      Safari: "Your browser's native MathML does not implement all the features " +
+               "used by MathJax, so some expressions may not render properly.",
+
       Firefox: "Your browser's native MathML does not implement all the features " +
-               "used by MathJax, so some expressions may render improperly."
+               "used by MathJax, so some expressions may not render properly."
     },
     
     SVG: {

unpacked/jax/output/NativeMML/jax.js

@@ -233,6 +233,10 @@
         container.onmousedown   = EVENT.Mousedown;
         container.onclick       = EVENT.Click;
         container.ondblclick    = EVENT.DblClick;
+	if (HUB.Browser.noContextMenu) {
+	  container.ontouchstart = TOUCH.start;
+	  container.ontouchend   = TOUCH.end;
+	}
       }
     },