Prepare Rakefile and gemspec for release.

Rakefile

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+require 'rake'
+require 'rake/testtask'
+require 'rake/rdoctask'
+
+task :default => :gem
+
+begin
+  require 'rake/gempackagetask'
+  require 'logger.gemspec'
+  Rake::GemPackageTask.new(SPEC) do |pkg|
+    pkg.need_zip = true
+    pkg.need_tar = true
+  end
+rescue LoadError
+end
+
+begin
+  require 'rcov/rcovtask'
+  Rcov::RcovTask.new("coverage") do |rcov|
+    rcov.libs << 'lib'
+    rcov.pattern = 'test/test_*.rb'
+  end
+rescue LoadError
+end
+
+Rake::TestTask.new("test") do |test|
+  test.libs << 'lib'
+  test.warning = true
+  test.pattern = 'test/test_*.rb'
+end
+
+Rake::RDocTask.new("doc") do |rdoc|
+  load 'lib/logger.rb'
+  rdoc.rdoc_dir = 'doc'
+  rdoc.title = "Logger Library Document: Version #{Logger::VERSION}"
+  rdoc.rdoc_files.include('lib/logger.rb')
+end

logger.gemspec

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+require 'rubygems'
+SPEC = Gem::Specification.new do |s|
+  require 'lib/logger.rb'
+  s.name = "logger"
+  s.version = Logger::VERSION
+  s.date = "2011-05-14"
+  s.author = "NAKAMURA, Hiroshi"
+  s.email = "nahi@ruby-lang.org"
+  s.homepage = "http://github.com/nahi/logger"
+  s.platform = Gem::Platform::RUBY
+  s.summary = "simple logging utility"
+  s.files = ["README", "lib/logger.rb", "test/test_logger.rb", *Dir.glob("sample/*.rb")]
+  s.require_path = "lib"
+  s.has_rdoc = true
+end