Work on Version 2 Started

This weekend, I am starting work on version 2 of the library. Planned new features are functions to replace invalid UTF-8 sequences with a replacement marker and iterator adapters (see Feature request tracker for details) and possibly some work on the exception classes.

Be aware that version 1 is going to be activelly supported. I don't plan to add many features to it (trying to keep it stable :) ) but if any bug pops up, I'll do my best to fix it.