Store GTFS stop times as UTC datetime

instead of EST strings
Fixed bug that somtimes crashed ftp script

If there was no adherence, the trip id woudn't be set, and the script
would crash when it tried to read the trip id later
Moved busfinder js into it's own file
Finished the next bus API

It returns the last stop and the next 3 stops
Added next bus info to the UI
Merge pull request #16 from bschoenfeld/next-bus

Provide user with real time of next bus. Closes #8.