add online users information services.
[FIX] Problem upload issue
Merge pull request #109 from mzry1992/fix-problem-issue

[FIX] Problem upload issue
[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
[FIX] Use the same locale in code
Merge pull request #117 from mzry1992/fix-locale

[FIX] Use the same locale in code
add equals and hashCode method for UserDTO.
display the number of currently online registered user in footer.
[UPDATE] Send registry review state changes to team leader
Merge pull request #120 from mzry1992/review-state-notification

Send registry review state changes to team leader
[FIX] Adjust time in datetimepicker directive
Merge pull request #121 from mzry1992/date-timer-picker-locale-issue

Date timer picker locale issue
use ng-bind span to display onlineUsersCount
Merge pull request #106 from iv404/online-users

Online users information.
[UPDATE] Do not rejudge accepted status