Reword 'Specific Aims' section
Small edits to last sentence in Specific Aims section
Retitle "existing work" section and add intro
Move bit about busbus not being a new standard into section intro
Fix GTFS footnote to match format of others
Add needed comma in GTFS paragraph
Alex suggested removing 'The' here
Clean up start of agency-specific APIs paragraph
Split agency-specific APIs paragraph into two
s/id/ID/
Clean up first two sentences in multi-agency APIs
Remove slash from subsection header
Split long footnote line in TeX code
Split multi-agency section into multiple paragraphs
Adjust Transit App paragraph