[Project] Add the Podfile to the Pods project.

CHANGELOG.md

@@ -33,6 +33,7 @@
 - The subversion downloader now does an export instead of a checkout, which
   makes it play nicer with SCMs that store metadata in each directory.
   [#245](https://github.com/CocoaPods/CocoaPods/issues/245)
+- Now the Podfile is added to the Pods project for convenient editing.
 
 ###### Bug fixes
 

lib/cocoapods/project.rb

@@ -12,8 +12,11 @@ def self.new_pod_dir(project, pod_name, path)
 
 module Pod
   class Project < Xcodeproj::Project
+    include Config::Mixin
+
     def initialize(*)
       super
+      main_group << files.new('path' => config.project_podfile.to_s, 'xcLanguageSpecificationIdentifier' => 'xcode.lang.ruby')
       main_group << groups.new('name' => 'Pods')
       @user_build_configurations = []
     end

spec/unit/project_spec.rb

@@ -11,6 +11,15 @@ def find_object(conditions)
     end.first
   end
 
+  it "adds the Podfile configured as a Ruby file" do
+    find_object({
+      'isa' => 'PBXFileReference',
+      'name' => 'Podfile',
+      'sourceTree' => 'SOURCE_ROOT',
+      'xcLanguageSpecificationIdentifier' => 'xcode.lang.ruby'
+    }).should.not == nil
+  end
+
   it "adds a group to the `Pods' group" do
     group = @project.add_spec_to_group('JSONKit', @project.pods)
     @project.pods.child_references.should.include group.uuid