Allow Timeline to use FeedAPI Item: Date

This is a very simple patch that allows Timeline to use FeedAPI Item's Date for display. This date is nice to have because it may differ from the node creation date on your site. It just checks to see if FeedAPI is installed and if it is adds feedapi_node_item_timestamp to the allowable temporal field items to use.

Lightly tested with a demo here: http://ic.metanomy.org/?q=timeline

Please note
1)That site is running a custom parser for Common Alerting Protocol (CAP), so if you are familiar with FeedAPI and wondering what the heck is going on - that's it.
2)I am also running the Date 2 Timeline patch from here: http://drupal.org/node/280038

R,
Coby