** Added google calendar plugin into default plugins
** Added muikku-google-calendar plugin into version control (does not do
anything yet)
** Commented old calendar controller out
** Commented old calendar rest service out
** Changed edu.emory.mathcs.backport.java.util.Collections references to
java.util.Collections
** Removed some unused imports
** Added interfaces for CalendarServiceProvider and Calendar into core
project
** Added support for storing oauth access tokens into session controller
** Changed oauth providers to store access tokens into session
controller
** Added missing AccessToken class under version control
** Removed ical4j dependency from core plugins
** Removed / commented out rest of the references into ical4j