Optimized google directions payload for sending to python server (reduced from 6 MB -> 12 KB) by truncating irrelevant information
Organized trip-cost.js to include all prototype functions within one TripCost.prototype = {} declaration
Modified calc-trip-cost to calculate cost. Added some error checking and rudimentary conversions between distance units (metric to imperial) as well as converting json to python dict
Added favicon

Some minor bugfixes/enhancements...