rename AsciiDoctor to Asciidoctor

[mojavelinux]

No description provided.

[mojavelinux]

Technically, this change should go a bit deeper. Asciidoctor is the processor. AsciiDoc is the file format. Therefore, whenever you are referring to something that is the asset, I think it should be "AsciiDoc". When you are referring to how the asset is processed, or options that get passed to the processor, then it is "Asciidoctor".

I'm in support of the name asciidoctor-asset-pipeline since this implementation specifically uses Asciidoctor. However, the name asciidoc-asset-pipeline would certainly make sense as well.

[craigburke]

@mojavelinux awesome. I think I'll keep the name asciidoctor-asset-pipeline since I'm ok tailoring it specifically to asciidoctor.