Fix bad defaults.encodeNames check.

Author: papandreou

lib/builder.js

@@ -506,7 +506,7 @@ function processCompileOpts(options, defaults) {
   extend(opts, defaults);
   extend(opts, options);
 
-  if (options.encodeNames && (!'encodeNames' in defaults))
+  if (options.encodeNames && !('encodeNames' in defaults))
     throw new Error('encodeNames is only supported for buildStatic.');
 
   if (typeof opts.production != 'boolean')