Implementing the Database class.

* Updated the Database class to work like a Singleton with a getInstance() method.

 * The Database class does not have a private constructor so it can still be instantiated in case someone needs to do so.

 * Replaced Logger class with Log class.

 * Updated Module to have an instance of the Database object as well as the Model class.

 * In my perfect vision for usage, the Module classes should never talk directly to the database, but do so via Models, but I know that's asking a lot, so I'm leaving in some options for folks.

 * Updated documentation.

classes/Module.php

@@ -28,6 +28,14 @@
  */
 class Module extends Object
 {
+	/**
+	 * Database
+	 *
+	 * @access protected
+	 * @var    object
+	 */
+	protected $db = null;
+
 	/**
 	 * Page title
 	 *
@@ -132,6 +140,8 @@ class Module extends Object
 	{
 		parent::__construct();
 
+		$this->db = Database::getInstance();
+
 		if ($autorun === true)
 		{
 			$this->__default();