Added rake dev:db:reset.

Author: fredwu

README.md

@@ -14,3 +14,7 @@
 
 - `rake spec` for integration and unit tests
 - `rake cucumber` for acceptance tests
+
+## Development Notes
+
+In order to keep DB migration to minimum, migration files are modified during the development. Please run `rake dev:db:reset` to keep your database schema up to date.

lib/tasks/application.rake

@@ -0,0 +1,13 @@
+# development-only tasks
+if Rails.env.development?
+  namespace :dev do
+    namespace :db do
+      desc "recreates the development database from migration, and updates the db schema if necessary"
+      task :reset => :environment do
+        Rake::Task['db:drop'].invoke
+        Rake::Task['db:create'].invoke
+        Rake::Task['db:migrate'].invoke
+      end
+    end
+  end
+end