message: allows for multiple installs on different Vue classes closes
diff: @@ -7,8 +7,10 @@ import { warn, isCallable } from './core/utils';
  let Vue;
  function install (_Vue, options = {}) {
  - if (Vue) {
  + if (Vue && _Vue === Vue) {
  + if (process.env.NODE_ENV !== 'production') {
  warn('already installed, Vue.use(VeeValidate) should only be called once.');
  + }
  return;
  }
  