Fix bug: directive sort is not stable on Chrome

[furybean]

I'm building a tabs component. It is used like this:

<tabs>
  <tab title="1">Tab1</tab>
  <tab title="2">Tab2</tab>
  <tab title="3">Tab3</tab>
  <tab title="4">Tab4</tab>
  <tab title="5">Tab5</tab>
  <tab title="6">Tab6</tab>
  <tab title="7">Tab7</tab>
  <tab title="8">Tab8</tab>
  <tab title="9">Tab9</tab>
  <tab title="10">Tab10</tab>
</tabs>

Live demo(Works fine)

It works fine when there are less than 10 <tab>s. But tabs will disorder when I have more than 10 <tab>s.

Live demo(Bug)

The main reason is that the directive sorting by priority is not stable on Chrome.

I fixed this bug using a sort method(time: O(n), space: O(n)), It also can be fixed using a stable sort method such as merge sort.

[yyx990803]

多谢，我发布 1.0.26 的时候忘记先 merge 这个了...