Fully hooked the Deliverable columns into the filters and Queries

* The Deliverable subject can now be filtered on the issues list
* The Deliverable subject can now be displayed on the issues lists with
  as a default column or part of a saved query
* The issues can be sorted by the deliverable

  #1148

lib/issue_patch.rb

@@ -0,0 +1,50 @@
+require_dependency 'issue'
+
+module IssuePatch
+  def self.included(base)
+    base.extend(ClassMethods)
+
+    base.send(:include, InstanceMethods)
+
+    # Same as typing in the class 
+    base.class_eval do
+      unloadable # Send unloadable so it will not be unloaded in development
+      belongs_to :deliverable
+      
+    end
+
+  end
+  
+  module ClassMethods
+
+    # Muck with the find arguements to append an include for deliverables
+    def find(*args)
+      # Options defined
+      if args[1].is_a?(Hash)
+        # include used?
+        if args[1].has_key?(:include)
+          # Add our include
+          args[1][:include] << :deliverable
+        else
+          # Add an include
+          args[1][:include] = [:deliverable]
+        end
+      end
+      super
+    end
+    
+  end
+  
+  module InstanceMethods
+    def deliverable_subject
+      unless self.deliverable.nil?
+        return self.deliverable.subject
+      end
+    end
+  end    
+end
+
+# Add module to Issue
+Issue.send(:include, IssuePatch)
+
+