Added new demo that can be used to test the javaScript version of ALVAR.
Added description of the demo 5.
Merge branch 'master' into dev
New POI protocol, some optimizations
Merge branch 'master' of https://github.com/Chiru/WeX
Added poi_backend under demos/
poi_demo_2 - AR data query, poi_demo_3 - Communication changed to REST
Merge branch 'master' of https://github.com/Chiru/WeX
demos/poi_backend updated to conform to the latest POI-DB API specifications

Some code refactoring done all around.

backendServer_http.py:
* Updated to the latest POI-DB API specification
* Added multiprocessing support enabling the backend to efficiently
  utilize multiple CPUs
* Added gzip support to reduce the size of the returned data

poi_data_manager.py:
* Improved security against SQL injections using psycopg2's execute()
  method for passing variables, see http://initd.org/psycopg/docs/usage.html#the-problem-with-the-query-parameters
Merge branch 'master' into dev
Updated to newest xml3d.js version.
New features added into the scene and sensor management. Communication.js added, it will handle the REST communication between AR application and remote services. minor changes into framework and namespace.
Asset files modified.