Update addressing several issues

- Keyboard did disappear when a suggested-tag in was selected
- Exposing _currentLine as a property now (not sure yet if it is a good idea, but right now I use that property in my app.)
- LZTag has a description-method now
- LZTagView has a new method - (NSSet *) tagSetOfStrings which returns a S
set of strings (convenience-method for my current app)
- some small tweaks

Also the example project was updated.