Change tile fetch timeout from 5 seconds to 2 minutes

Tile generation sometimes takes longer than 5 seconds.

Author: bgilbert

examples/deepzoom/templates/index.html

@@ -111,6 +111,7 @@ <h1>Slide properties</h1>
     var viewer = new OpenSeadragon({
         id: "view",
         prefixUrl: "static/images/",
+        timeout: 120000,
         showNavigator: false,
         animationTime: 0.5,
         blendTime: 0.1,