[maven-release-plugin] prepare release CalendarPortlet-2.1.0-RC2
[maven-release-plugin] prepare release CalendarPortlet-2.1.0-RC2

bjagg/CalendarPortlet,bjagg/CalendarPortlet,manhattancollege/up-calendar-portlet,Jasig/CalendarPortlet,manhattancollege/up-calendar-portlet,Jasig/CalendarPortlet