Use view bean to specify view class instead of view name
Merge pull request #180 from mzry1992/contest-permission

Fix strange 404 error in server
remove duplicates in tried problem IDs and accepted problem IDs.
Merge pull request #181 from pfctgeorge/status-services

remove duplicates in tried problem IDs and accepted problem IDs.
add statuses for normal type user.
fix typo.
make status test data more various.
add test cases of countProblemUserTried.
add test cases of countProblemUserAccepted.
add test cases of findAllUserTriedProblemIds.
add test cases of findAllUserAcceptedProblemIds.
add test case of countUsersTriedProblem.
add test cases of countUsersAcceptedProblem.
add test cases of count.
add test cases of getStatusList.
add test case of getStatusInformation.
Merge pull request #184 from pfctgeorge/tests

add test cases for StatusService.
add test cases for LanguageService.
Merge pull request #185 from pfctgeorge/tests

add test cases for LanguageService.
add test cases for ArticleService.