Modify delegate for more customization

Modified delegate function configurePickerView: to pass a
reference to the ActionSheetPicker object as well apart from the
pickerView.
Merge branch 'master' of https://github.com/NikDude/ActionSheetPicker
Accept NSObject as data / rows parameter in ActionSheetStringPicker. The description method will be called for display.
Merge pull request #112 from copperoxide/master

Accept NSObject as data / rows parameter in ActionSheetStringPicker. The...
Update README.md
Update README.md
Merge branch 'master' of https://github.com/NikDude/ActionSheetPicker

Conflicts:
	README.md
Merge pull request #110 from NikDude/master

Modified delegate to allow for more customisation