Just use ProjectIntegration directly.

lib/cocoapods/command/install.rb

@@ -42,7 +42,8 @@ module Pod
         end
         installer = Installer.new(podfile)
         installer.install!
-        installer.configure_project(@projpath) if @projpath
+
+        ProjectIntegration.integrate_with_project(@projpath) if @projpath
       end
     end
   end

lib/cocoapods/installer.rb

@@ -122,10 +122,6 @@ module Pod
         end
       end
     end
-
-    def configure_project(projpath)
-      ProjectIntegration.integrate_with_project(projpath)
-    end
     
     def dependent_specifications
       @dependent_specifications ||= Resolver.new(@podfile, @definition ? @definition.dependencies : nil).resolve