Fix live_preview option #374.

lib/gollum/frontend/app.rb

@@ -76,7 +76,7 @@ module Precious
       @name = params[:splat].first
       wiki = Gollum::Wiki.new(settings.gollum_path, settings.wiki_options)
       if page = wiki.page(@name)
-        if settings.wiki_options[:live_preview] && page.format.to_s.include?('markdown') && supported_useragent?(request.user_agent)
+        if wiki.live_preview && page.format.to_s.include?('markdown') && supported_useragent?(request.user_agent)
           redirect '/livepreview/index.html?page=' + encodeURIComponent(@name)
         else
           @page = page

lib/gollum/wiki.rb

@@ -133,6 +133,9 @@ module Gollum
     # Gets the Array of chars to sub for ws in filenames.
     attr_reader :ws_subs
 
+    # Gets the boolean live preview value.
+    attr_reader :live_preview
+
     # Public: Initialize a new Gollum Repo.
     #
     # path    - The String path to the Git repository that holds the Gollum