Fix null point exception in rank list export function
Merge pull request #196 from mzry1992/fix-contest-reanklist-bug

Fix null point exception in rank list export function
Move judge core binary file to /usr/bin, remove config.ini.
Add settings table in database
Add settings db tools
Rename settings to setting
Rename SettingsService to SettingService
Refactor setting tools
Remove data and work directory in WEB-INF
Auto create work path and temp path
Move judge core to /usr/local/bin
Add comment to settings data
Use enum to locate setting id
Migrate util/type to util/enums
Set dummy value in settings table
Fix import order
Merge pull request #198 from mzry1992/refactor-settings

Refactor settings and judge core
Move static resources out of webapp
Modify git submodule configure
Set static resources path