Task popup

Since @ZayneS will provide a detailed design, I don't tweak the UI too much.

![screen shot 2014-09-23 at 10 13 52 pm](https://cloud.githubusercontent.com/assets/1242553/4383709/99f1d918-43a9-11e4-839d-302af454a6b3.png)

Replace `pull-right` to `text-right`