Add gem release Rakefile

Rakefile

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+require 'rubygems'
+require 'bundler/setup'
+require 'rspec/core/rake_task'
+
+# Immediately sync all stdout so that tools like buildbot can
+# immediately load in the output.
+$stdout.sync = true
+$stderr.sync = true
+
+# Change to the directory of this file.
+Dir.chdir(File.expand_path("../", __FILE__))
+
+# This installs the tasks that help with gem creation and
+# publishing.
+Bundler::GemHelper.install_tasks
+
+# Install the `spec` task so that we can run tests.
+RSpec::Core::RakeTask.new(:spec) do |t|
+  t.rspec_opts = "--order defined"
+end
+# Default task is to run the unit tests
+task :default => :spec