add a plugin for login logout.
old login logout will be ignore soon
add some files that last commit forgoten.
add user system in login logout xxxx
add function of upload user logo but with some bugs to be fix mainly in:
show action,
    1. we should present the first logo of the user at first, to be update
    2. after user choose the first pic, the jcrop is loaded, but if the user change another pic right now, something wrong happended, to be fix.