revert deleting i386 for simulator

Because simulator of old device type (like 'iPhone 5') needs i386 binary.
If remove i386, it can't launch the app on 'iPhone 5' device.

NEWS

@@ -7,8 +7,6 @@
   * [iOS] Fixed a bug where it couldn't debug with `rake device debug=1' on
     device. Now, debugging only support `armv7' in `app.archs['iPhoneOS']'.
     (i.e. app.archs['iPhoneOS'] = ['armv7'])
-  * [iOS] Removed compiling `i386' for iOS simulator in order to reduce compile
-    time. By default, `x86_64' only will be built for simulator.
   * [iOS] Fixed a bug where it could not deploy app to iOS 8.2 beta 3 device.
   * [iOS] Fixed a bug where it could not deploy app which contained Watch app.
   * [OSX] Fixed a bug where NSString#initWithXXX would trigger a crash by double

lib/motion/project/template/ios.rb

@@ -64,9 +64,6 @@ namespace :build do
 
   desc "Build the simulator version"
   task :simulator do
-    # No longer build for i386 by default.
-    App.config.archs['iPhoneSimulator'].delete('i386') if App.config.archs['iPhoneSimulator'].include?('x86_64')
-
     pre_build_actions('iPhoneSimulator')
     App.build('iPhoneSimulator')
   end