Move from git submodule to gem bundle

.gitmodules

@@ -1,3 +0,0 @@
-[submodule "arel"]
-	path = arel
-	url = git://github.com/miloops/arel.git

activerecord/Gemfile

@@ -0,0 +1,10 @@
+Gem.sources.each { |uri| source uri }
+sibling = "#{File.dirname(__FILE__)}/.."
+
+gem "activesupport", "3.0.pre", :vendored_at => "#{sibling}/activesupport"
+gem "activemodel", "3.0.pre", :vendored_at => "#{sibling}/activemodel"
+gem "arel", :git => "git://github.com/rails/arel.git", :branch => 'master'
+
+only :test do
+  gem "mocha"
+end

activerecord/activerecord.gemspec

@@ -9,6 +9,7 @@ Gem::Specification.new do |s|
 
   s.add_dependency('activesupport', '= 3.0.pre')
   s.add_dependency('activemodel',   '= 3.0.pre')
+  s.add_dependency('arel',          '~> 0.1.0')
 
   s.require_path = 'lib'
   s.autorequire = 'active_record'

activerecord/test/cases/helper.rb

@@ -1,6 +1,9 @@
 $:.unshift(File.dirname(__FILE__) + '/../../lib')
 $:.unshift(File.dirname(__FILE__) + '/../../../activesupport/lib')
 
+bundler = "#{File.dirname(__FILE__)}/../../vendor/gems/environment"
+require bundler if File.exist?("#{bundler}.rb")
+
 require 'config'
 
 require 'rubygems'

arel

@@ -1 +0,0 @@
-Subproject commit 927d8b8cde930244a16215c57896c8e45f616d0f