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.