changes

a) fix the url validator bug
b) fix the image category bug in database
remove the old gamimag database, use the new gampic database
fix the column container model to display image in reverse order of upload time
some changes

a) change the banner so that it only display when the use is guest
b) add a function to generate game category menu so it is more robust
c) small clean up + add comment
add pass in category
finish display by category