Move shell script creation out of installer

lib/cocoapods/installer.rb

@@ -219,14 +219,8 @@ module Pod
         build_phase.files << libfile.buildFiles.new
       end
       
-      copy_resources = app_project.objects.add(Xcode::Project::PBXShellScriptBuildPhase, {
-        'name' => 'Copy Pods Resources',
-        'files' => [],
-        'inputPaths' => [],
-        'outputPaths' => [],
-        'shellPath' => '/bin/sh',
-        'shellScript' => "${SRCROOT}/Pods/Pods-resources.sh\n"
-      })
+      copy_resources = app_project.add_shell_script_build_phase('Copy Pods Resources',
+"${SRCROOT}/Pods/Pods-resources.sh\n")
       app_project.targets.each { |target| target.buildPhases << copy_resources }
       
       app_project.save_as(projpath)

lib/cocoapods/xcode/project.rb

@@ -626,6 +626,17 @@ module Pod
           'sourceTree' => 'SDKROOT'
         })
       end
+      
+      def add_shell_script_build_phase(name, script_path)
+        objects.add(Xcode::Project::PBXShellScriptBuildPhase, {
+          'name' => name,
+          'files' => [],
+          'inputPaths' => [],
+          'outputPaths' => [],
+          'shellPath' => '/bin/sh',
+          'shellScript' => script_path
+        })
+      end
 
       def build_files
         objects.select_by_class(PBXBuildFile)