upgrade to Opal 0.6.3

- update dependency configuration
- rebuild against Opal 0.6.3
- add missing dist files for chrome and man inline macro extensions
Merge pull request #79 from mojavelinux/issue-77

upgrade to Opal 0.6.3
upgrade to Asciidoctor 1.5.2
Merge pull request #81 from mojavelinux/asciidoctor-1.5.2

upgrade to Asciidoctor 1.5.2
don't load xmlhttprequest module if provided or false