fix(@angular/cli): Prevent showing options with visible false

Author: Brocco

packages/@angular/cli/tasks/schematic-get-options.ts

@@ -30,6 +30,7 @@ export default Task.extend({
     const keys = Object.keys(properties);
     const availableOptions = keys
       .map(key => ({...properties[key], ...{name: stringUtils.dasherize(key)}}))
+      .filter(opt => opt.visible !== false)
       .map(opt => {
         let type;
         const schematicType = opt.type;