[FIXED] Issue #49 Avatar disappear in user center page.
fix #16 - show all submissions when user is admin.
Merge pull request #54 from mzry1992/mzry1992

Fix Issue #49
Merge pull request #56 from lyhypacm/hide-admin-submissions

fix #16 - show all submissions when user is admin.
Merge pull request #56 from mzry1992/problemListFix
[FIX] Show user problem status in problem list
add DTO for contest user entity.
Merge pull request #60 from pfctgeorge/contest-registration

add DTO for contest user entity.