ability to use custom "selectedRect" images, ability to customize view for selected row

Now you can explicitly specity name for selectedRect image, and also
customize row view regarding to weather it is currently selected or not
ability to select rows programmatically, examples for row selection and view modification for selected element

- values for valueSelector can be selected programmatically
- example for selecting those values
- example for view modification for selected element
Merge pull request #3 from deniskrut/master

SelectedRow improvement