Add a method that returns a given page name scoped to a directory.

This is to allow access to non unique pages.

lib/gollum/page.rb

@@ -364,9 +364,9 @@ module Gollum
     # version - The String version ID to find.
     #
     # Returns a Gollum::Page or nil if the page could not be found.
-    def find(name, version)
+    def find(name, version, dir = nil)
       map = @wiki.tree_map_for(version.to_s)
-      if page = find_page_in_tree(map, name)
+      if page = find_page_in_tree(map, name, dir)
         page.version    = version.is_a?(Grit::Commit) ?
           version : @wiki.commit_for(version)
         page.historical = page.version.to_s == version.to_s

lib/gollum/wiki.rb

@@ -199,6 +199,18 @@ module Gollum
       @page_class.new(self).find(name, version)
     end
 
+    # Public: Get the formatted page for a given page name scoped to a
+    # directory.
+    #
+    # name    - The human or canonical String page name of the wiki page.
+    # dir     - The directory String relative to the repo.
+    # version - The String version ID to find (default: @ref).
+    #
+    # Returns a Gollum::Page or nil if no matching page was found.
+    def scoped_page(name, dir, version = @ref)
+      @page_class.new(self).find(name, version || @ref, dir)
+    end
+
     # Public: Get the static file for a given name.
     #
     # name    - The full String pathname to the file.