First steps for an own wiki.

* Scaffold for Page Objekt
* Using textile for rendering html
* Easy wiki-links with [[wikipage]]

app/models/page.rb

@@ -0,0 +1,12 @@
+class Page < ActiveRecord::Base
+
+  validates_presence_of :title, :body
+
+  before_save :set_permalink
+
+  def set_permalink
+    if self.permalink.blank? #FIXME: or title.changed?
+      self.permalink = Page.count == 0 ? "home" : "#{title.downcase.strip.gsub(/ |\.|@/, '-')}"
+    end
+  end
+end