Fix #592 be able to set default tags for a project. Default tags can now be specified when creating or editing a project, and they will be applied to any new todos created in that project.

db/migrate/20090301154745_add_default_tags_to_project.rb

@@ -0,0 +1,9 @@
+class AddDefaultTagsToProject < ActiveRecord::Migration
+  def self.up
+    add_column :projects, :default_tags, :string
+  end
+
+  def self.down
+    remove_column :projects, :default_tags
+  end
+end