optimize module statics for PDO
fix function dblikeescape in db class
fix error pdo
fix error search
fix when change rewite_exturl
Merge pull request #10 from nukeviet/develop

develop
Edit pdo module : banner
Edit pdo module : download
Edit pdo module : menu
Edit pdo module : news
Edit pdo module : page
Edit pdo module : user
Merge pull request #87 from PhamQuocTien132/develop

develop
format code
fix call preg_replace_callback in php 5.2
block site if agent empty
change admin link
fix HTTP_USER_AGENT
optimize code for oracle database
edit groups users