For methods which take in an ID (type Long) as a parameter, a check is now performed to see if they are null or not. if they are null then an exception is thrown
new methodscalculateTotalNumberOfUsersgetSessionIdsFromContentgetNumberOfUsersInSessionWhich is used to generate the statistics in the monitoring environment
all utility functions are now in the one class NbWebUtil instead of having a separate util class for each environmnent (authoring monitoring and learner)