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
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