修正 travis-ci 随机出现的几个问题

```bash
  1) user phones I can save phone
     Failure/Error: page.should have_content(I18n.t('flash.user_phones.updated'))
       expected to find text "手机已经绑定！" in "alpha 我的订单 john355 × 建议您绑定手机，以便活动时间、地点等信息发生变化时，及时收到短信通知；点击 这里 绑定 。 注册信息 个人资料 绑定手机 绑定手机 手机号码 感谢19屋的赞助商： 反馈问题 联系我们 源代码@GitHub"
     # ./spec/features/user_phones_spec.rb:17:in `block (2 levels) in <top (required)>'
```


```bash
  1) EventHelper#group_event_followers_path when event is not the last should == "/events/1/followers"
     Failure/Error: it { should == "/events/#{event.id}/followers" }
       expected: "/events/1/followers"
            got: "/rubyconfchina/followers" (using ==)
     # ./spec/helpers/event_helper_spec.rb:82:in `block (4 levels) in <top (required)>'
  2) EventHelper#group_event_path when event is not the last should == "/events/1"
     Failure/Error: it { should == "/events/#{event.id}" }
       expected: "/events/1"
            got: "/rubyconfchina" (using ==)
     # ./spec/helpers/event_helper_spec.rb:68:in `block (4 levels) in <top (required)>'
  3) user orders has paid I can not refund order when event draws near
     Failure/Error: expect(page).to have_no_content(I18n.t('views.my_orders.request_refund'))
       expected #has_no_content?("退款") to return true, got false
     # ./spec/features/user_orders_spec.rb:59:in `block (3 levels) in <top (required)>'
```