Adds Pro Event Options for setting a start and end date range of Events
to query, using jQuery UI DatePicker

Adds Pro Event Option for setting an event image size.  Options are
Small, Normal, Large, and Square.  Small is the Default option.

git-svn-id: https://plugins.svn.wordpress.org/ik-facebook/trunk@1020501 b8457f37-d9ea-0310-8a92-e5e31aec5664