Text_Wiki: a new rendering algorithm

toggg pointed out a webpage (http://d.hatena.ne.jp/sumipan/20060304/1141493832) which seems to point out that Text_Wiki is doing char-by-char iteration in order to render the tokens in the parsed source. I'd of course seen this before, but hadn't really thought about it. I implemented a simple preg_replace_callback solution as well and it seems to be around 20% faster. I'm not sure about memory usage, however. I've left in the old code as well. To use the new algorithm set the newRendering member variable on the object. If people could test the new algorithm and possibly do some memory and CPU tests of their own I'd appreciate it. (Or if anyone has any suggestions for how to profile the code with free tools I'll try to test it more myself.) -- Justin Patrin