Made the add_emission() methods of the Source model return the emission
Renamed the ALOB keys of the sfoc_base properties of the Source model
Added a set_design_speed callback to the IHS lookup service
Added a timeout argument to the lookupservices' BaseHTTPFetcher
Fixed an uncaught exception in the lookupservices' BaseHTTPFetcher
Made DatabaseStreams use the replace unicode error policy
Updated the README with some developer tips