upgrade to newest codemirror

www/code/CodeMirror-5.16.0/mode/ruby/test.js

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+// CodeMirror, copyright (c) by Marijn Haverbeke and others
+// Distributed under an MIT license: http://codemirror.net/LICENSE
+
+(function() {
+  var mode = CodeMirror.getMode({indentUnit: 2}, "ruby");
+  function MT(name) { test.mode(name, mode, Array.prototype.slice.call(arguments, 1)); }
+
+  MT("divide_equal_operator",
+     "[variable bar] [operator /=] [variable foo]");
+
+  MT("divide_equal_operator_no_spacing",
+     "[variable foo][operator /=][number 42]");
+
+})();