Update to Unicode 6.3.0

6.3.0 was released on September 30, 2013.

http://unicode-inc.blogspot.com.ar/2013/09/announcing-unicode-standard-version-63.html

activesupport/lib/active_support/multibyte/unicode.rb

@@ -11,7 +11,7 @@ module Unicode
       NORMALIZATION_FORMS = [:c, :kc, :d, :kd]
 
       # The Unicode version that is supported by the implementation
-      UNICODE_VERSION = '6.2.0'
+      UNICODE_VERSION = '6.3.0'
 
       # The default normalization used for operations that require
       # normalization. It can be set to any of the normalizations