Float the details view action buttons toward the left

Adjust the buttons in the view issue details page to float toward the left:

Fixes: 17819

Before:

![screen shot 2014-10-31 at 10 22 11 pm](https://cloud.githubusercontent.com/assets/1354889/4870892/e29b8e0c-618b-11e4-8284-8b441d053dde.png)

After:

![screen shot 2014-10-31 at 10 55 02 pm](https://cloud.githubusercontent.com/assets/1354889/4870893/eb6ed958-618b-11e4-93e3-85a6655314f3.png)