OgEx 0.3.0

This release introduces the controller card DSL and dedicated image dispatch.

og_card :show, PostOgCard associates a card with one controller action.
Card.load/2 loads image data without running the normal controller action.
A controller function passed with load: can replace the card loader.
image_route: :path generates /opengraph-image/TOKEN and
/twitter-image/TOKEN URLs.
image_route: :query generates ?__og_ex=TOKEN URLs.
Path requests can be handled by og_ex_routes() in the router or by
plug OgEx, router: MyAppWeb.Router in the endpoint.
Duplicate declarations and simultaneous router/endpoint integrations are
detected instead of being silently accepted.
Loader failures return non-cacheable 404 or 503 responses.
The 0.2 render(..., og: ...) API remains available during migration.

Install:

{:og_ex, "~> 0.3.0"}

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