More Python 3 code update
Remove unused code

The temporary converter code is no longer required.
Use Django 1.6
travis-ci: Use PostgreSQL 9.3 and PostGIS 2.1
travis-ci: Use precompiled Python's psycopg2 and lxml
travis-ci: Update PostGIS script
travis-ci: Set PYTHONPATH
travis-ci: Use Python 3.3
travis-ci: Compile Python 3's psycopg2 and lxml