fix a bug in build system where it cannot build app with Korean as app.name

http://hipbyte.myjetbrains.com/youtrack/issue/RM-247

1)
  String#encode cannot convert from UTF8-MAC to UTF-8 propery.
  Looks like iconv library handles it, however Ruby 2.0 does not bundle iconv library.
  So, we need to bundle the tool/library to convert the encoding using the Objective-C API in order to convert reliably.

  If we bundled it as Ruby C extension library, it will not work between 1.8/1.9/2.0 because Ruby 1.8/1.9/2.0 have not binary compatibility.
  So, we need to bundle three binaries for 1.8/1.9/2.0.

  Therefore, we bundles an executable binary to convert the encoding.

2)
  If we converted from NFD to NFC, it might not match between original NFC and converted NFC even if we used Objective-C API.
  We should normalized with NFD where it handles the string which retrived from filesystem.

lib/motion/project/builder.rb

@@ -35,6 +35,7 @@ module Motion; module Project;
 
       ruby = File.join(config.bindir, 'ruby')
       llc = File.join(config.bindir, 'llc')
+      @nfd = File.join(config.bindir, 'nfd')
 
       if config.spec_mode and (config.spec_files - config.spec_core_files).empty?
         App.fail "No spec files in `#{config.specs_dir}'"
@@ -375,7 +376,7 @@ EOS
       reserved_app_bundle_files = [
         '_CodeSignature/CodeResources', 'CodeResources', 'embedded.mobileprovision',
         'Info.plist', 'PkgInfo', 'ResourceRules.plist',
-        config.name
+        convert_filesystem_encoding(config.name)
       ]
       resources_paths = []
       config.resources_dirs.each do |dir|
@@ -403,7 +404,6 @@ EOS
       resources_files = resources_paths.map { |x| path_on_resources_dirs(config.resources_dirs, x) }
       Dir.chdir(app_resources_dir) do
         Dir.glob('*').each do |bundle_res|
-          bundle_res = convert_filesystem_encoding(bundle_res)
           next if File.directory?(bundle_res)
           next if reserved_app_bundle_files.include?(bundle_res)
           next if resources_files.include?(bundle_res)
@@ -435,13 +435,7 @@ EOS
     end
 
     def convert_filesystem_encoding(string)
-      begin
-        string.encode("UTF-8", "UTF8-MAC")
-      rescue
-        # for Ruby 1.8
-        require 'iconv'
-        Iconv.conv("UTF-8", "UTF8-MAC", string)
-      end
+      eval `#{@nfd} "#{string}"`
     end
 
     class << self