Version 2.0

Changes:

- Added new Parameter to Openings::isOpen()
   Method head is now:
   public function isOpen( $offset = "now" )
   $offset must be "now" or "Y-m-d H:i" date string

- Openings and Exceptions now get formatted in the isOpen()-Method

- Changed the way how Exceptions are added and now it is possible to add multiple Exceptions