Adds the Mailer and MockNotification classes to planning poker in the no...

...tifications package. Also adds to Janeway two jars: javax.mail.jar and activation.jar. These are required for the Mailer class which is not yet in use due to conflicts in what it asked for. MockNotification is called upon clicking the submit button when creating a new session and simply creates a popup saying that you have notified the team of a session