CRM-14037 fix -  Class 'CRM_Activity_BAO_Contact' not found	Activity.php	/civicrm/CRM/Activity/BAO	line 2366	DLTK Problem

http://issues.civicrm.org/jira/browse/CRM-14037
Merge pull request #2302 from monishdeb/CRM-14037

CRM-14037 fix -  Class 'CRM_Activity_BAO_Contact' not found /civicrm/CRM/Activity/BAO/Activity.php DLTK Problem