Added duration to tasks. Annotated all models.

test/fixtures/assignments.yml

@@ -1,3 +1,5 @@
+# Read about fixtures at http://ar.rubyonrails.org/classes/Fixtures.html
+
 # == Schema Information
 #
 # Table name: assignments
@@ -5,7 +7,6 @@
 #  id       :integer         not null, primary key
 #  user_id  :integer         default(0), not null
 #  task_id  :integer         default(0), not null
-#  accepted :boolean
+#  accepted :boolean         default(FALSE)
 #
 
-# Read about fixtures at http://ar.rubyonrails.org/classes/Fixtures.html