Use DN mobile API to get available cars.

DriveNow's regular website was modified, so that the calls to get the car information did not work anymore.
Luckily the mobile website still works for that. So it was only a change to what server make the call to.
Make booking-button for multicity more comfortable.
Bumps version number and adds log-entry
Merge branch 'release-1.7.0.3' into develop