Compiling warnings should be fixed

Hi: there is a lot of compiling warnings in truk(branch also), I have fixed most of them unless those in Zend/* here is the warning log: http://pastebin.com/ah3qtP6A (compile with I think it is better to fix them all, since we should release a perfect project(although most of them are no issue) of course I can do it, but need a zend karma. thanks -- Laruence  Xinchen Hui http://www.laruence.com/