Add some missing things in the routing:

Missing files in the `app.js`:
plugins/OLSource.js #GXP
OpenLayers/Layer/WMTS.js

Remove the include of
OpenLayers/Layer/Vector.js
Includes by dependencies

In the changelog add the missing of adding the `[routing.js]` section in
the `app.js`.
Merge pull request #726 from camptocamp/routing-fix

Add some missing things in the routing: