Added feed aggregation module.

Redesigned the CMS_BLOCK system,
   - added condition attribute. It can be set via configuration file
     with
     [blocks]
      {blockid}.region={region_name}
      {blockid}.conditions[]=is_front
      {blockid}.conditions[]=path:location-path/foo/bar
   - For backward compatibility, the CMS will check only conditions for block name prefixed by "?".
Improved the configuration library to support list and table properties.
Updated theme for now, to include the feed examples.
Added "cache" classes, to ease caching of html output for instance. (TODO: improve by providing a cache manager).

examples/demo/modules/demo/cms_demo_module.e

@@ -93,7 +93,7 @@ feature -- Hooks
 
 	block_list: ITERABLE [like {CMS_BLOCK}.name]
 		do
-			Result := <<"demo-info">>
+			Result := <<"?demo-info">>
 		end
 
 	get_block_view (a_block_id: READABLE_STRING_8; a_response: CMS_RESPONSE)
@@ -103,8 +103,8 @@ feature -- Hooks
 			m: CMS_MENU
 			lnk: CMS_LOCAL_LINK
 		do
-			if a_block_id.is_case_insensitive_equal_general ("demo-info") then
-				if a_response.request.request_uri.starts_with ("/demo/") then
+			if a_block_id.same_string ("demo-info") then
+				if a_response.location.starts_with_general ("demo/") then
 					create m.make_with_title (a_block_id, "Demo", 2)
 					create lnk.make ("demo: abc", "demo/abc")
 					m.extend (lnk)