/cc @bnjbvr
This closes #58 (closed).
Note: With this commit, your db needs to be migrated, but I did not yet write the migration. Basically, you need to manually create the tables for https://git.phyks.me/Phyks/flatisfy/blob/tcl/flatisfy/models/postal_code.py and https://git.phyks.me/Phyks/flatisfy/blob/tcl/flatisfy/models/public_transport.py.