Load/Save settings

- renamed all settings with dot syntax
- refactored Menu->settings()
- changed schema of settings table to allow longer setting name and value
- added getAll() static method on Setting Model to fetch all settings (with proper unserialize of value)

lib/Config/Migrator.php

@@ -60,8 +60,8 @@ class Migrator {
   function settings() {
     $attributes = array(
       'id mediumint(9) NOT NULL AUTO_INCREMENT,',
-      'name varchar(20) NOT NULL,',
-      'value varchar(255) NOT NULL,',
+      'name varchar(50) NOT NULL,',
+      'value mediumtext NOT NULL,',
       'created_at TIMESTAMP NOT NULL DEFAULT 0,',
       'updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,',
       'PRIMARY KEY  (id),',