Implemented CMS storage for user and nodes.

Implemented role and permission storage.
Introduced the CMS_PARTIAL_NODE and CMS_PARTIAL_USER.
Added support for node storage extension
  - storage of data specific to each node content type,
  - in addition to the core CMS_NODE)
  - For now, only implemented for SQL storage.
Note: in current version, CMS_PAGE support is hard coded in the core,
    (as opposed to be only supported by the node module.)
Commented/removed for now, the Web API code to update node summary, title, via REST request.

examples/demo/site/themes/bootstrap/page.tpl

@@ -5,6 +5,7 @@
 	<meta name="viewport" content="width=device-width, initial-scale=1">
 	<!-- EWF CMS -->
 	<link rel="stylesheet" href="{$site_url/}/theme/css/style.css">
+	<link rel="stylesheet" href="{$site_url/}/theme/css/node.css">
 	<!-- bootstrap framework -->
 	<!-- Latest compiled and minified CSS -->
 	<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css">
@@ -70,8 +71,6 @@
 <!-- Latest compiled and minified JavaScript -->
 	<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js"></script>
 
-<!--
 {include file="debug.tpl"/}
--->
 </body>
 </html>