Makes wiki text formatter pluggable.

Original patch #2025 by Yuki Sonoda slightly edited.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@1955 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine.rb

@@ -6,6 +6,7 @@ require 'redmine/core_ext'
 require 'redmine/themes'
 require 'redmine/hook'
 require 'redmine/plugin'
+require 'redmine/wiki_formatting'
 
 begin
   require_library_or_gem 'RMagick' unless Object.const_defined?(:Magick)
@@ -150,3 +151,7 @@ Redmine::Activity.map do |activity|
   activity.register :wiki_edits, :class_name => 'WikiContent::Version', :default => false
   activity.register :messages, :default => false
 end
+
+Redmine::WikiFormatting.map do |format|
+  format.register :textile, Redmine::WikiFormatting::Textile::Formatter, Redmine::WikiFormatting::Textile::Helper
+end