Attempt to handle IE >= 10 pointer events

Using the same technique as Leaflet, this relays MSPointer events to touch
events. Using the simulator, I can verify that even pinch-zoom works with
this change, but the visual experience is a bit jumpy. Would be great if
people could test this on physical touch devices and see how it looks/feels
there.

theme/default/style.css

@@ -7,6 +7,7 @@ div.olMap {
 
 div.olMapViewport {
     text-align: left;
+    -ms-touch-action: none;
 }
 
 div.olLayerDiv {

theme/default/style.mobile.css

@@ -43,6 +43,9 @@ div.olControlZoom a:hover {
         background: rgba(0, 60, 136, 0.5);
     }
 }
+div.olMapViewport {
+    -ms-touch-action: none;
+}
 .olLayerGrid .olTileImage {
     -webkit-transition: opacity 0.2s linear;
     -moz-transition: opacity 0.2s linear;