Revert "Button functionality WIP"

This reverts commit 0c184288bc973c3ff41436c343607d82c5d530dc.
Add start/stop functionality to the button
Refactor updating the map from the current Journey

Now, RecordFragment doesn't keep track of the current Journey at all.
That's solely the responsibility of the TrackingService.
Merge pull request #18 from routemaster/service-start-stop

Service start/stop