Improve performance of RaceItemAdapter by using a ViewHolder
Improve performance of RaceItemAdapter by using a ViewHolder

As suggested by:
http://www.vogella.com/articles/AndroidListView/article.html

Signed-off-by: Greg Meiste <8a8f45e57c045ec63dc7e56e5eda862ea8c7cd4f@gmail.com>

meisteg/PickTheWinner,meisteg/PickTheWinner,meisteg/PickTheWinner