* Changed open public transport vocabulary to open transport vocabulary as discussed in #2.
* Broadened the scope of a `stop_point` and added properties
* Added semantics for an `agency` and a `vehicle`
* Extracted all GTFS notes and put them in mapping_to_gtfs.md
Updated README.md for docs folder and added link christophe.duquesne contributed
Added `agency` and `mode`
Merge pull request #5 from OpenTransport/development

Development of issues #1 and #2