** Added modified property into UserImage entity
** Removed profileImage property from User entity
** Changed UserController from RequestScoped -> Dependent
** Added methods for handling profile images into UserController
** Removed profile image references from CompactUserBean
** Removed profile image nulling from MaterialController deleteMaterial
method
** Added getLoggedHasProfileImage method into SessionBackingBean
** Changed profile image servlet to work with UserImage entity instead
of user.profileImage