initial commit
Add first draft of TCH schemas and start on NPTG importer
More work on NPTG and NaPTAN importers
Start work to a Mongo-backed non-Django project
Add Travis CI config
Added binary dependency to Travis config
Make Identifiers immutable, and more work on NPTG importer
Start work on Locality service
Complete first pass on localities importer
Add attribution to NPTG parser
Add some docs

Also, remove old models
Ensure that localities in Mongo have an index on URL
Early work on NaPTAN parser

At this point in time this should yield bus stops with an associated
calling point from a NaPTAN file
Add early airport support to NaPTAN parser
Import ports and further work on airports

This eliminates the concept of multi-terminal airports as interchanges
and models it as one airport with each terminal being a calling point
(gates inside a terminal could be modelled as sub-calling points
in future)

Also added support for a few edge cases which appear in the real
data
Airports which do not have terminals should have their own calling point
Parse rail stations

Rail platforms do not appear to be in the latest NaPTAN dump
Parse metro stations
Add support for bus station bays and variable bays (incomplete)
Handle platforms coming before stops in NaPTAN