Feature proposal: Add API Blueprint rendering

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API Blueprint (https://apiblueprint.org/) is a markdown-like language for describing APIs. The documentation is often part of the repository in form of a .apib file. Gitlab could render it, same as it renders .md files.

This is from the deprecated feedback forum: http://feedback.gitlab.com/forums/176466-general/suggestions/10271382-add-api-blueprint-rendering