Feincms-pages-api

* Add `djangorestframework` v3.3 support
* Add support for Django 1.8.
* Drop support for Django 1.6.

* Add `djangorestframework` v3.2 support

Notes:
* `request.QUERY_PARAMS` has been deprecated for `request.query_params`
* add `view_name` to `extra_kwargs['url']`

* Support rendering `Page` content types as `json`. (Merge `0.2.0`)

* Add django-rest-framework v3 support.
* Remove django-rest-framework v2 support.

* Support rendering `Page` content types as `json`.

* Support `django-orderable` version `3`.