Moved registeredUsers collection to ServletContext
Fixed bug where getUsersList() was returning null instead of an empty list
Merge branch 'ServletContextDataStorage' into WebService

Conflicts:
	WebService/deployment/TaskCommander.war
	WebService/src/DataTier.java
	WebService/src/LogoutServlet.java
	WebService/src/Portal.java
	WebService/src/RTMConnection.java