Start of feature to alert user of traversing a speed limit roundel is
displayed in the botton of application to show current speed limit this
should be modified later to allow selectable speed limits of 30,40,50,60
and 70 mph
Removal of unused elements in new SpeedRoundelView as well as addition
of method to set the speed limit
Change the Speed Roundels to be incorporated into a ViewFlipper which
contains 5 roundels (30,40,50,60,70) currently they can't flip but this
is next part to be worked on