Added page for admin to upload images to be used as advertisements.
Cleaned up authentication
Upload ad and set hyperlink on admin/ads.php page. Print out ads in feed.
Check to make sure there are ads in the db
Update preview to show ad already in db
Gave up (temporarily) on using responseXML. Currently sending two XmlHttpRequests.
Merge branch 'master' into AdminAndAds

Conflicts:
	conDB.php
	lib/credentials.php
Added some checks in case there are no ads
Merge branch 'AdminAndAds'

Conflicts:
	lib/credentials.php
	lib/siteInit.php
Can't commit an empty folder