add admin rake tasks

Rakefile

@@ -9,3 +9,37 @@ desc "Kick it"
 task :kick do
   exec "kicker -e rake test lib"
 end
+
+begin
+  require 'jeweler'
+  $LOAD_PATH.unshift 'lib'
+  require 'github/markup/version'
+  Jeweler::Tasks.new do |gemspec|
+    gemspec.name = "github_markup"
+    gemspec.summary = "The code we use to render README.your_favorite_markup"
+    gemspec.description = "The code we use to render README.your_favorite_markup"
+    gemspec.email = "chris@ozmm.org"
+    gemspec.homepage = "http://github.com/defunkt/github_markup"
+    gemspec.authors = ["Chris Wanstrath"]
+    gemspec.version = GitHub::Markup::Version
+  end
+rescue LoadError
+  puts "Jeweler not available."
+  puts "Install it with: gem install jeweler"
+end
+
+begin
+  require 'sdoc_helpers'
+rescue LoadError
+  puts "sdoc support not enabled. Please gem install sdoc-helpers."
+end
+
+desc "Push a new version to Gemcutter"
+task :publish => [ :test, :gemspec, :build ] do
+  system "git tag v#{GitHub::Markup::Version}"
+  system "git push origin v#{GitHub::Markup::Version}"
+  system "git push origin master"
+  system "gem push pkg/github_markup-#{GitHub::Markup::Version}.gem"
+  system "git clean -fd"
+  #exec "rake pages"
+end