insertion of Annotation class docs into annotate docstring broken

Sphinx 1.2.2 and 1.3.0a mangle it rather badly,  entire "Other Parameter" section is in bold, none of the tables are made.  The docs render correctly on the `Annotation` class.

![image](https://cloud.githubusercontent.com/assets/199813/3209895/840bc740-ee94-11e3-8d37-f3c075ed0d74.png)