[UPDATE] Fix contest editor
Merge pull request #111 from mzry1992/fix-contest-editor

Fix contest editor
[FIX] SQL Grammar exception in registration list
Merge pull request #113 from mzry1992/fix-registration-list

[FIX] SQL Grammar exception in registration list
[FIX] incorrect boundary when decide whether user can delete team member
Merge pull request #115 from mzry1992/fix-issue-114

Fix problem when delete team member and the member number is 3