added default styling for <button> and type=button

![screen shot 2013-08-14 at 1 20 27 pm](https://f.cloud.github.com/assets/3171887/964202/13cd5f78-0512-11e3-9b75-1fd1fcadfd91.png)
![screen shot 2013-08-14 at 1 34 40 pm](https://f.cloud.github.com/assets/3171887/964205/162d0ba6-0512-11e3-9efd-0f85e6a47aa3.png)