Added an 'edit timeline' button to the program edit page
Also made the create timeline functionality use the logic modules
introduced in the previous commit.
Patch by: Sverre Rabbelier
Started on edit timeline
Added a gsoc timeline logic module. Also added a scope_path as the
key_field to timeline. Updated the django_paterns to only include
the edit field and removed link_id as dynafield.
Patch by: Sverre Rabbelier