Move libraries layout', model', `peristence' under cms folder

Updated code to the new layout.
Added missing comments.
Remove /example/api

cms/persistence/implementation/common/cms_storage_null.e

@@ -0,0 +1,166 @@
+note
+	description: "Summary description for {CMS_STORAGE_NULL}."
+	date: "$Date$"
+	revision: "$Revision$"
+
+class
+	CMS_STORAGE_NULL
+
+inherit
+
+	CMS_STORAGE
+		redefine
+			default_create
+		select
+			default_create
+		end
+	REFACTORING_HELPER
+		rename
+			default_create as default_create_rh
+		end
+
+feature -- Initialization
+
+	default_create
+		do
+			create error_handler.make
+		end
+
+feature -- Access: user
+
+	has_user: BOOLEAN
+			-- Has any user?
+		do
+		end
+
+	all_users: LIST [CMS_USER]
+		do
+			create {ARRAYED_LIST[CMS_USER]} Result.make (0)
+		end
+
+	user_by_id (a_id: like {CMS_USER}.id): detachable CMS_USER
+		do
+		end
+
+	user_by_name (a_name: like {CMS_USER}.name): detachable CMS_USER
+		do
+		end
+
+	user_by_email (a_email: like {CMS_USER}.email): detachable CMS_USER
+		do
+		end
+
+	is_valid_credential (l_auth_login, l_auth_password: READABLE_STRING_32): BOOLEAN
+		do
+		end
+
+feature -- User Nodes
+
+	user_collaborator_nodes (a_id: like {CMS_USER}.id): LIST[CMS_NODE]
+			-- Possible list of nodes where the user identified by `a_id', is a collaborator.
+		do
+			create {ARRAYED_LIST[CMS_NODE]} Result.make (0)
+		end
+
+	user_author_nodes (a_id: like {CMS_USER}.id): LIST[CMS_NODE]
+			-- Possible list of nodes where the user identified by `a_id', is the author.
+		do
+			create {ARRAYED_LIST[CMS_NODE]} Result.make (0)
+		end
+
+feature -- Change: user
+
+	save_user (a_user: CMS_USER)
+			-- Add a new user `a_user'.
+		do
+		end
+
+feature -- Access: roles and permissions
+
+	user_role_by_id (a_id: like {CMS_USER_ROLE}.id): detachable CMS_USER_ROLE
+		do
+		end
+
+	user_roles: LIST [CMS_USER_ROLE]
+		do
+			create {ARRAYED_LIST[CMS_USER_ROLE]} Result.make (0)
+		end
+
+
+feature -- Change: roles and permissions		
+
+	save_user_role (a_user_role: CMS_USER_ROLE)
+		do
+		end
+
+
+feature -- Access: node
+
+	nodes: LIST[CMS_NODE]
+			-- List of nodes.
+		do
+			create {ARRAYED_LIST[CMS_NODE]} Result.make (0)
+		end
+
+	recent_nodes (a_lower: INTEGER; a_count: INTEGER): LIST [CMS_NODE]
+			-- List of the `a_count' most recent nodes, starting from `a_lower'.
+		do
+			create {ARRAYED_LIST[CMS_NODE]} Result.make (0)
+		end
+
+	node (a_id: INTEGER_64): detachable CMS_NODE
+			-- <Precursor>
+		do
+		end
+
+	node_author (a_id: like {CMS_NODE}.id): detachable CMS_USER
+			-- Node's author. if any.
+		do
+		end
+
+	node_collaborators (a_id: like {CMS_NODE}.id): LIST [CMS_USER]
+			-- Possible list of node's collaborator.
+		do
+			create {ARRAYED_LIST[CMS_USER]} Result.make (0)
+		end
+
+feature -- Node
+
+	save_node (a_node: CMS_NODE)
+			-- Add a new node
+		do
+		end
+
+	delete_node (a_id: INTEGER_64)
+			-- <Precursor>
+		do
+		end
+
+	update_node (a_id: like {CMS_NODE}.id; a_node: CMS_NODE)
+			-- <Precursor>
+		do
+		end
+
+	update_node_title (a_id: like {CMS_NODE}.id; a_node_id: like {CMS_NODE}.id; a_title: READABLE_STRING_32)
+			-- <Precursor>
+		do
+		end
+
+	update_node_summary (a_id: like {CMS_NODE}.id; a_node_id: like {CMS_NODE}.id; a_summary: READABLE_STRING_32)
+			-- <Precursor>
+		do
+		end
+
+	update_node_content (a_id: like {CMS_NODE}.id; a_node_id: like {CMS_NODE}.id; a_content: READABLE_STRING_32)
+			-- <Precursor>
+		do
+		end
+
+feature -- User
+
+	new_user (a_user: CMS_USER)
+			-- Add a new user `a_user'.
+		do
+		end
+
+end