merge revision(s) 48161:

	* lib/rexml/entity.rb: keep the entity size within the limitation.
	  reported by Willis Vandevanter <will@silentrobots.com> and
	  patched by nahi.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@48164 b2dd03c8-39d4-4d8f-98ff-823fe69b080e