Redmine2.5とredmine_redcarpet_formatterプラグインの衝突回避 ref: http://qiita.com/mather314/items/79e082bf4f9f9300c0a9

file0.diff

-gem "redcarpet"
+#gem "redcarpet"

file1.diff

 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

 require 'redmine'
-require 'redmine/wiki_formatting/markdown/formatter'
-require 'redmine/wiki_formatting/markdown/helper'
+require 'redmine/wiki_formatting/redcarpet_markdown/formatter'
+require 'redmine/wiki_formatting/redcarpet_markdown/helper'


 Redmine::Plugin.register :redmine_redcarpet_formatter do

file2.diff

   description 'Markdown wiki formatting by Redcarpet for Redmine'
   version '2.1'

-  wiki_format_provider 'markdown', Redmine::WikiFormatting::Markdown::Formatter, Redmine::WikiFormatting::Markdown::Helper
+  wiki_format_provider 'redcarpet_markdown', Redmine::WikiFormatting::RedcarpetMarkdown::Formatter, Redmine::WikiFormatting::RedcarpetMarkdown::Helper

   settings :default => {
     'enable_hardwrap' => '1',

file3.diff

 module Redmine
   module WikiFormatting
-    module Markdown
+    module RedcarpetMarkdown
       class Formatter
         #    include ActionView::Helpers::TagHelper

file4.diff

 module Redmine
   module WikiFormatting
-    module Markdown
+    module RedcarpetMarkdown
       module Helper
         unloadable