Add a border to other marked regions

When performing a find/replace, all additional results are highlighted with a border

Before:
![screen shot 2014-05-12 at 9 13 50 pm](https://cloud.githubusercontent.com/assets/945258/2952599/46aaeb6a-da3f-11e3-960d-32d10b518065.png)

After:
![screen shot 2014-05-12 at 9 13 22 pm](https://cloud.githubusercontent.com/assets/945258/2952603/5713d0e8-da3f-11e3-87ae-a53d30c9edf6.png)