Fica

* Updated `fica.Config` to mark a key as not-defaulted when it is updated using `__setattr__`

* Added the `factory` argument to `fica.Key` per [21](https://github.com/chrispyles/fica/issues/21)
* Added user config key validation to `fica.Config` per [12](https://github.com/chrispyles/fica/issues/12)
* Added `fica.Key.get_default` per [17](https://github.com/chrispyles/fica/issues/17)
* Updated Sphinx extension to always show subkeys for keys with subkey containers and to show the default value in a comment at the top of the subkeys per [25](https://github.com/chrispyles/fica/issues/25)
* Clarified error messages for errors thrown when creating/updating `fica.Config` objects per [29](https://github.com/chrispyles/fica/issues/29)

* Added `MANIFEST.in`

* Fixed the repo URL in `setup.py`

* Added the `name` argument to `fica.Key`
* Added `fica.Config.get_user_config` per [19](https://github.com/chrispyles/fica/issues/19)
* Renamed `fica.Config.update_` to `fica.Config.update`

* Fixed `fica.Config` to maintain the order keys are declared in
* Added the `documentation_mode` argument to `fica.Config`