Add shortcut to export route

Press 'X' to trigger the export route dialog.

Automatically populating the trackname field should work too.

js/control/Export.js

@@ -1,6 +1,12 @@
 BR.Export = L.Class.extend({
     latLngs: [],
 
+    options: {
+        shortcut: {
+            export: 88 // char code for 'x'
+        }
+    },
+
     initialize: function(router, pois) {
         this.router = router;
         this.pois = pois;
@@ -20,6 +26,8 @@ BR.Export = L.Class.extend({
         this.exportButton.on('click', L.bind(this._generateTrackname, this));
         L.DomUtil.get('submitExport').onclick = L.bind(this._export, this);
 
+        L.DomEvent.addListener(document, 'keydown', this._keydownListener, this);
+
         this.update([]);
     },
 
@@ -116,6 +124,17 @@ BR.Export = L.Class.extend({
                 }
             })
         );
+    },
+
+    _keydownListener: function(e) {
+        if (
+            BR.Util.keyboardShortcutsAllowed(e) &&
+            e.keyCode === this.options.shortcut.export &&
+            !this.exportButton.hasClass('disabled')
+        ) {
+            this._generateTrackname();
+            $('#export').modal('show');
+        }
     }
 });