Postable bracket.

Fixes issue #37.

The current version looks like this:
![bracket-1](https://f.cloud.github.com/assets/1675190/831589/d7487cb2-f1f8-11e2-981d-1c37bc6d5c8f.jpg)


I recommend testing this on python 2.6 as I use python 2.7.3 for development.