GUI -- Relabeled "Meta to select" button to "Pan/Zoom" -- makes more sense to me.

Change-Id: I331ff3aa584a42dcda5c2323b46297c9ca089a13

@@ -1222,7 +1222,7 @@
             meta = srcEv.metaKey,
             shift = srcEv.shiftKey;
 
-        if ((metaSelect() && !meta) || (!metaSelect() && meta)) {
+        if ((panZoom() && !meta) || (!panZoom() && meta)) {
             return;
         }
 
@@ -1388,7 +1388,7 @@
 
     function setupZoomPan() {
         function zoomed() {
-            if (!metaSelect() ^ !d3.event.sourceEvent.metaKey) {
+            if (!panZoom() ^ !d3.event.sourceEvent.metaKey) {
                 zoomPan(d3.event.scale, d3.event.translate);
             }
         }
@@ -1444,16 +1444,16 @@
     //  by the framework; not generated by the view.
 
     var showTrafficOnHover,
-        metaToSelect;
+        doPanZoom;
 
     function addButtonBar(view) {
         var bb = d3.select('#mast')
             .append('span').classed('right', true).attr('id', 'bb');
 
-        metaToSelect = bb.append('span')
+        doPanZoom = bb.append('span')
             .classed('btn', true)
-            .text('Meta to select')
-            .on('click', toggleMetaSelect);
+            .text('Pan/Zoom')
+            .on('click', togglePanZoom);
 
         showTrafficOnHover = bb.append('span')
             .classed('btn', true)
@@ -1469,12 +1469,12 @@
         return showTrafficOnHover.classed('active');
     }
 
-    function toggleMetaSelect() {
-        metaToSelect.classed('active', !metaSelect());
+    function togglePanZoom() {
+        doPanZoom.classed('active', !panZoom());
     }
 
-    function metaSelect() {
-        return metaToSelect.classed('active');
+    function panZoom() {
+        return doPanZoom.classed('active');
     }
 
     // ==============================
@@ -1563,7 +1563,7 @@
             .on('tick', tick);
 
         network.drag = d3u.createDragBehavior(network.force,
-            selectCb, atDragEnd, metaSelect);
+            selectCb, atDragEnd, panZoom);
 
         // create mask layer for when we lose connection to server.
         mask = view.$div.append('div').attr('id','topo-mask');