Instrumental Seismic Catalogue Viewer integration with geonode2

This is a first pass to integrate a pre-existing application from our old geonode1.2 based project to the geonode2.0 based project (based on django template project) created with https://github.com/gem/oq-platform/pull/54 (which should land first in order to have a clean diff).

In order to have a clean production code, we still miss a deploy script that automates the database creation and the geoserver configuration. Moreover, I haven't cared much about layout and styling of both the application and data.

I have also removed the gxp_googlecoder plugin, as well as the tilestream plugin (which I think it should be integrated in an another pull request)