[WSS-441] - Allow the date/time in the security headers to be spoofed


Conflicts:
	src/main/java/org/apache/ws/security/WSSConfig.java
	src/main/java/org/apache/ws/security/message/token/Timestamp.java
	src/main/java/org/apache/ws/security/message/token/UsernameToken.java
	src/test/java/org/apache/ws/security/message/TimestampTest.java
	src/test/java/org/apache/ws/security/message/UsernameTokenTest.java

git-svn-id: https://svn.apache.org/repos/asf/webservices/wss4j/branches/1_6_x-fixes@1490700 13f79535-47bb-0310-9956-ffa450edef68