add imagePicker for installer

install/css/image-picker.css

install/css/merged_css.css

install/img/background/01.jpg

install/img/background/02.jpg

install/img/background/03.jpg

install/img/background/04.jpg

install/img/background/05.jpg

install/img/background/06.jpg

install/img/background/07.jpg

install/img/background/08.jpg

install/img/background/09.jpg

install/img/background/10.jpg

install/img/background/11.jpg

install/img/background/12.jpg

install/img/background/13.jpg

install/img/background/14.jpg

install/img/background/15.jpg

install/img/background/16.jpg

install/js/image-picker.js

install/lang/en.php