Activator and Wordpress templates

If you add ``addSbtPlugin("org.eigengo" % "sbt-mdrw" % "1.0.0-SNAPSHOT")`` to your ``~/.sbt/0.12.3/plugins.sbt``, every project you use will include the ``mdrw`` command, which can rewrite the markdown files in _base_/``tutorial`` directory to HTML.

The parameter of the ``mdrw`` command can be the name of the rewriter; currently, I support ``activator`` and ``wordpress``. As you can imagine, the ``activator`` generates HTML suitable for the Typesafe Activator, ``wordpress`` generates HTML suitable for Wordpress.