Fixes bugs for undefined index

This is a fix for the files: options.php, gabfire-widgets.php,
widget-flickr.php, and widget-recent-tweets.php.  I added a isset()
mehtod check before comparing variables to solve the undefined index
error.  Also, the links and hashtags are now clickable in the twitter
widget. All chagnes were made by Kyle Benk kjbenk@gmail.com