Correct "?x" style number literals to numerical literals

ruby-1.8> ?x # => 120 (ASCII code)
ruby-2.1> ?x # => "x" (String)

git-svn-id: https://svn.code.sf.net/p/rubycocoa/svn/trunk/src@2524 f4f36d40-9719-0410-9868-dde021a23eda