[Installer|TargetInstaller] Improve handling of frameworks in Pods project.

Gemfile.lock

@@ -9,7 +9,7 @@ GIT
 
 GIT
   remote: git://github.com/CocoaPods/Xcodeproj.git
-  revision: d2bd1824f39ca1f2742e1e7af352db36251a267d
+  revision: 72b587172e84cfd38aa9ce70c5f6075aca19973c
   specs:
     xcodeproj (0.4.0)
       activesupport (~> 3.2.6)

lib/cocoapods/installer.rb

@@ -220,7 +220,7 @@ module Pod
     def generate_names_of_pods_to_install
       changed_pods_names = []
       if update_mode
-        changed_pods_names += pods.select do |pods|
+        changed_pods_names += pods.select do |pod|
           pod.top_specification.version.head? ||
             resolver.pods_from_external_sources.include?(pod.name)
         end
@@ -334,9 +334,6 @@ module Pod
         local_pods.each do |pod|
           pod.add_file_references_to_project(pods_project)
           pod.link_headers
-          pod.frameworks.each do |framework|
-            file_ref= pods_project.add_system_framework(framework, pod.platform.name)
-          end
 
           unless pod.resources.empty?
             resources_group = pods_project.new_group(pod.name, "Resources")
@@ -406,6 +403,7 @@ module Pod
     #
     def write_pod_project
       UI.message "- Writing Xcode project file to #{UI.path sandbox.project_path}" do
+        pods_project['Frameworks'].sort_by_type!
         pods_project.main_group.sort_by_type!
         pods_project.save_as(sandbox.project_path)
       end

lib/cocoapods/installer/target_installer.rb

@@ -22,7 +22,7 @@ module Pod
       def install!
         add_file_reference_for_support_files
         add_target
-        add_build_files_to_target
+        add_pod_references
 
         create_xcconfig_file
         create_prefix_header
@@ -126,15 +126,25 @@ module Pod
           c.base_configuration_reference = xcconfig_file_ref
         end
 
-        library.target = @target
+      library.target = @target
       end
 
-      # Adds the build files of the pods to the target.
+      # Adds the build files of the pods to the target and adds a refence to
+      # the frameworks of the Pods.
+      #
+      # @note   The Frameworks are used only for presentation purporses as the
+      #         xcconfig is the authoritative source about their information.
       #
       # @return [void]
       #
-      def add_build_files_to_target
-        pods.each { |p| p.add_build_files_to_target(target) }
+      def add_pod_references
+        pods.each do |pod|
+          pod.add_build_files_to_target(target)
+
+          pod.frameworks.each do |framework|
+            framework_ref = project.add_system_framework(framework, target)
+          end
+        end
       end
 
       # Generates the contents of the xcconfig file and saves it to disk.