Add making queries to documentation

[Permafacture]

Sorry if I missed this (and I didn't find a mailing list). Looping through entities is very convenient, but I'd like to specify queries for performance. Trying to make a query did not work as expected:

Stop = pygtfs.gtfs_entities.Stop
stops = schedule.session.query(Stop).all()

[...]

ArgumentError: Column-based expression object expected for argument 'order_by'; got: 'stop_sequence', type <type 'str'>     

Is there support for specifying SQLalchemy queries is pygtfs? How do I use it?

Thanks. Elliot

[Permafacture]

Edit: this must actually be a bug somewhere, or I am misusing the ORM, as it works with Routes...

[jarondl]

Does this still happen? Or was it fixed by the recent changes?