* Fix#1759, Grape integration, adds serialization_context
- `serialization_context` is added in grape formatter so grape continues to render models without an explicit call to the `render` helper method
- Made it straightforward for subclasses to add other serializer options (such as `serialization_scope`).
* Updated Grape tests to include:
- paginated collections
- implicit Grape serializer (i.e. without explicit invocation of `render` helper method)
* Update Changelog with fixes.
- improves improves serialization_context to take options and not depend
on a `request` object.
- adds descriptive error on missing serialization_context.
- Document overriding `CollectionSerializer#paginated?`.
- adds handling for when the returned resource is not serializable via ams
- fix for when resource is an Array
- Moves grape include to grape namespace. Changes Enumerable to Array because a plain hash is enumerable.
- Add integration test
- Refine scope of Grape version dependency
- Assert that the response is equal to a manually defined JSON string
- Add single module to include in Grape projects
- Create a Serializable Resource to test rails-api from Grape
- Update docs
- Fix discrepency between ActiveRecord 4.0 - 4.1 and 4.2
- Updated Changelog
- Remove parens from `render`, use `serializable` in all tests.
