enhance sencha touch example

[bartvde]

This ticket is to track the combined work from me and marcjansen on enhancing the Sencha touch example originally created by tschaub. The enhancements are a Geonames search interface as well as a basic layer switcher.

[fredj]

transitionEffect, remove unused functions in mobile.js, change Ext.ns from GeoExt to OpenLayers

[fredj]

I will do more test on android and iPad and mark as commit when it's done. (love the search window)

[fredj]

on android:

• the star point displays as a simple point (no svg renderer)
• search page: no clear button

I propose to remove the start point in mobile.js

[bartvde]

As discussed with crschmidt: since Sencha Touch is GPL, we cannot actually use the Google Maps API in the mobile example, so we should switch to Bing.

[marcjansen]

The new attachment:ol-3101.2.patch

• ... includes Bing instead of Google
• ... removes duplicate code from the previous patch
• ... adds a close button to the geonames search
• ... changes the styling of the vector feature
• ... renames the Vectorlayer from "Features" to "Lausanne"

[pgiraud]

(In [11483]) Enhancing the sencha touch example, p=mjansen,bartvde,fredj,pgiraud, (Closes #3101)