bmon: update from 2.0.1 to v3.3 latest.

Updates from v2.0.1 to the latest v3.3 version. Along the way fixes problem where an older version had been showing a weird characters in interfaces names:

![bmon 2 0 1](https://cloud.githubusercontent.com/assets/1107625/3650020/35fe617e-1118-11e4-9b04-4c90e66d488c.png)

Result:

![bmon v3 2](https://cloud.githubusercontent.com/assets/1107625/3650024/409c9632-1118-11e4-8b95-90e07f3b40c3.png)

Are these dependencies only needed when building `head`? If so, they should be in a `head` block, along with the URL; grep for `head do` in the formula directory.