Allow register() to be used for modules, too.

README.md

@@ -452,6 +452,9 @@ config.register myapp, __dirname,
 Like you see, you may also add the  attributes from the normal configuration
 like `uri` and so on.
 
+You may also register a module. Therefore give `null` as application name and
+it will only add the first two paths based on the given directory.
+
 
 Setup schema
 -------------------------------------------------

src/index.coffee

@@ -75,20 +75,21 @@ module.exports =
         parser: setup.parser
         path: setup.path
         filter: setup.filter
-    # add global
-    list.push
-      uri: "/etc/#{app}/#{uri}"
-      parser: setup.parser
-      path: setup.path
-      filter: setup.filter
-    # add user
-    dir = process.env.HOME ? process.env.USERPROFILE
-    list.push
-      uri: "#{dir}/.#{app}/config/#{uri}"
-      parser: setup.parser
-      path: setup.path
-      filter: setup.filter
-    @origin.push list
+    if app
+      # add global
+      list.push
+        uri: "/etc/#{app}/#{uri}"
+        parser: setup.parser
+        path: setup.path
+        filter: setup.filter
+      # add user
+      dir = process.env.HOME ? process.env.USERPROFILE
+      list.push
+        uri: "#{dir}/.#{app}/config/#{uri}"
+        parser: setup.parser
+        path: setup.path
+        filter: setup.filter
+      @origin.push list
 
   setSchema: (path, schema, cb = -> ) ->
     path = string.trim(path, '/').split '/'