fix bug where relative images in previews did not render

lib/gollum/page.rb

@@ -333,9 +333,9 @@ module Gollum
     # path - The String directory path of the page file.
     #
     # Returns the populated Gollum::Page.
-    def populate(blob, path)
+    def populate(blob, path=nil)
       @blob = blob
-      @path = (path + '/' + blob.name)[1..-1]
+      @path = "#{path}/#{blob.name}"[1..-1]
       self
     end
 

lib/gollum/wiki.rb

@@ -168,10 +168,10 @@ module Gollum
     def preview_page(name, data, format)
       page = @page_class.new(self)
       ext  = @page_class.format_to_ext(format.to_sym)
-      path = @page_class.cname(name) + '.' + ext
-      blob = OpenStruct.new(:name => path, :data => data)
-      page.populate(blob, path)
-      page.version = @access.commit('HEAD')
+      name = @page_class.cname(name) + '.' + ext
+      blob = OpenStruct.new(:name => name, :data => data)
+      page.populate(blob)
+      page.version = @access.commit('master')
       page
     end