fix coding style for every DTO.
Merge pull request #131 from pfctgeorge/fix-coding-style-DTO

fix coding style for every DTO.
change build configuration to fix idea issues.
Merge pull request #132 from lyhypacm/testing-better

change build configuration to fix idea issues.
fix setting wrong file name to FileInformationDTO issue.
fix path for contest archive zipFile.
fix zipFile name and temporary directory name duplicated issue.
minutes not seconds in time field of contestInfo.xml.
Merge pull request #135 from pfctgeorge/contest-management

Fix several bug in services about contest importer.