add changelog

Changelog

@@ -0,0 +1,11 @@
+0.26.1 12/05/2011 6160246da0fafe9cf8fde188d94bbc6babc667dc
+==========================================================
+
+Merge pull request #103 from csquared/load_env_from_irb   [David Dollar]
+refactor load_env to apply_environment   [Chris Continanza]
+rename load! to load_env!   [Chris Continanza]
+use ./.env as default   [Chris Continanza]
+load contents from env file   [Chris Continanza]
+refactor engine to expose env methods   [Chris Continanza]
+disable email notifications   [David Dollar]
+add travis config   [David Dollar]

Rakefile

@@ -166,3 +166,22 @@ end
 Dir[File.expand_path("../dist/**/*.rake", __FILE__)].each do |rake|
   import rake
 end
+
+task :changelog do
+  timestamp = Time.now.utc.strftime('%m/%d/%Y')
+  sha = `git log | head -1`.split(' ').last
+  changelog = ["#{version} #{timestamp} #{sha}"]
+  changelog << ('=' * changelog[0].length)
+  changelog << ''
+
+  last_sha = `cat Changelog | head -1`.split(' ').last
+  shortlog = `git log #{last_sha}..HEAD --pretty=format:'%s   [%an]'`
+  changelog << shortlog.split("\n")
+  changelog.concat ['', '', '']
+
+  old_changelog = File.read('Changelog')
+  File.open('Changelog', 'w') do |file|
+    file.write(changelog.join("\n"))
+    file.write(old_changelog)
+  end
+end