Split comment field out of map bugs table

Rather than have all comments in a single text field, have each comment in its own entry
and only combine them back on output

app/models/map_bug_comment.rb

@@ -0,0 +1,14 @@
+class MapBugComment < ActiveRecord::Base
+
+  set_table_name 'map_bug_comment'
+
+  belongs_to :map_bug, :foreign_key => 'bug_id'
+  
+  
+
+  validates_presence_of :id, :on => :update
+  validates_uniqueness_of :id
+  validates_presence_of :visible
+  validates_presence_of :date_created
+
+end