update gemgem, Rakefile, and .gitignore

.gitignore

@@ -1,7 +1,2 @@
-tmp
-pkg
-doc
-ann-*
-Gemfile.lock
-
+/pkg/
 *.rbc

Rakefile

@@ -1,28 +1,19 @@
-# encoding: utf-8
 
 begin
   require "#{dir = File.dirname(__FILE__)}/task/gemgem"
 rescue LoadError
-  sh "git submodule update --init"
-  exec Gem.ruby, "-S", "rake", *ARGV
+  sh 'git submodule update --init'
+  exec Gem.ruby, '-S', $PROGRAM_NAME, *ARGV
 end
 
-Gemgem.dir = dir
-($LOAD_PATH << File.expand_path("#{Gemgem.dir}/lib" )).uniq!
+Gemgem.init(dir) do |s|
+  require     'dm-is-reflective/version'
+  s.name    = 'dm-is-reflective'
+  s.version = DmIsReflective::VERSION
 
-desc 'Generate gemspec'
-task 'gem:spec' do
-  Gemgem.spec = Gemgem.create do |s|
-    require     'dm-is-reflective/version'
-    s.name    = 'dm-is-reflective'
-    s.version = DmIsReflective::VERSION
-
-    %w[dm-core dm-do-adapter].each{ |g| s.add_runtime_dependency(g) }
-    %w[dm-migrations
-       dm-sqlite-adapter
-       dm-mysql-adapter
-       dm-postgres-adapter].each{ |g| s.add_development_dependency(g) }
-  end
-
-  Gemgem.write
+  %w[dm-core dm-do-adapter].each{ |g| s.add_runtime_dependency(g) }
+  %w[dm-migrations
+     dm-sqlite-adapter
+     dm-mysql-adapter
+     dm-postgres-adapter].each{ |g| s.add_development_dependency(g) }
 end

dm-is-reflective.gemspec

@@ -1,12 +1,13 @@
 # -*- encoding: utf-8 -*-
+# stub: dm-is-reflective 1.3.1 ruby lib
 
 Gem::Specification.new do |s|
   s.name = "dm-is-reflective"
   s.version = "1.3.1"
 
   s.required_rubygems_version = Gem::Requirement.new(">= 0") if s.respond_to? :required_rubygems_version=
   s.authors = ["Lin Jen-Shin (godfat)"]
-  s.date = "2013-05-22"
+  s.date = "2013-09-28"
   s.description = "DataMapper plugin that helps you manipulate an existing database.\nIt creates mappings between existing columns and model's properties."
   s.email = ["godfat (XD) godfat.org"]
   s.executables = ["dm-is-reflective"]
@@ -41,7 +42,7 @@ Gem::Specification.new do |s|
   s.homepage = "https://github.com/godfat/dm-is-reflective"
   s.licenses = ["Apache License 2.0"]
   s.require_paths = ["lib"]
-  s.rubygems_version = "2.0.3"
+  s.rubygems_version = "2.1.5"
   s.summary = "DataMapper plugin that helps you manipulate an existing database."
   s.test_files = [
   "test/test_mysql.rb",