Correct duplicate PullRefresh issue for DOW Ex

5/6/2013 Commit Change Log:
Summary: Correct duplicate PullRefresh issue for DOW Hist example
- Deleted TouchTreeGrid.xdc from parent directory to avoid confusion as
each subdirectory
contains Touch-specific versions:
./TouchTreeGrid_Advanced_21/TouchTreeGrid.xdc (Touch 2.1)
./TouchTreeGrid_Basic_21/TouchTreeGrid.xdc (Touch 2.1)
./TouchTreeGrid_Advanced_220/TouchTreeGrid.xdc (Touch 2.2)
- ./TouchTreeGrid_Advanced_220/ modifications:
> TouchTreeGrid.model.Dow2012 requires idProperty and unique values in
store to prevent
duplicates when refreshing data via PullRefresh
> Replaced ./TouchTreeGrid_Advanced_220/data/dow2012.json to include
unique ID values