Remove System.out.println() debug codes;
Optimize ADAuthentication class and LoginAction;
Add revokeLeaveRecord method in LeaveServiceImpl;
Config revokeLeave.action in struts.xml
Revert "Remove System.out.println() debug codes; Optimize ADAuthentication class and LoginAction; Add revokeLeaveRecord method in LeaveServiceImpl; Config revokeLeave.action in struts.xml"

This reverts commit 226fcdf276e6a3a25b7632de8f7577d60d701d63.
Merge branch 'master' of https://github.com/jessehwong/Attendance.git
Add setter and getter of leaveId