Provide backend API for asynchronous review page [#71587338]
Add doc file for the asynch JSON.
[#71587338] sending async-trip json to review page
[#71587338] implement asysn rendering filters, legends, trip header & tick labels
[fixes#71587338] aysn render itineraries with chart; adjust exisiting itineraries when new response come in;moved chart click event listener from show.html.haml to review.js; replace chart tooltip with bootstrap tooltip so that be consistent with filter tip.