SSF : Identify Project/Deployment and change CRUD strings

* Fixed : Activity showing twice in the tasks list under a project. Eg - http://demo.ssf.sahanafoundation.org/demo/project/project/6/task
* Added milestones, sectors in sunflower projects
* Identified Project/Deployment on the basis of sector and changed the CRUD strings accordingly.
* Sorted RSS feeds by decreasing date, so that tasks in updates feed are in that order.