Remove legend type attribute

Author: mdtusz

src/components/legend/attributes.js

@@ -14,13 +14,6 @@ var extendFlat = require('../../lib/extend').extendFlat;
 
 
 module.exports = {
-    type: {
-        valType: 'enumerated',
-        values: ['vertical', 'dropdown'],
-        dflt: 'vertical',
-        role: 'style',
-        description: 'Sets the type of legend to be drawn.'
-    },
     bgcolor: {
         valType: 'color',
         role: 'style',