Fix #247 - Replaced button to plan trips by one which swaps origin and destination. Now when a destination or other specific parameters are set (like time) trip request is automatically triggered.
Fix #247 - Add "switch origin/destination" icon images
Merge pull request #319 from CUTR-at-USF/issue247-ReplaceTripPlanButton

Fix #247 - Replaced plan trip button with swap trips, auto-plan trip