WIP: Embed in babel-using Javascript frameworks

[obilodeau]

Running smoke tests with the ruby build (instead of the previous javascript one) fails with:

$ node test/smoke.js 

/home/olivier/src/asciidoc/asciidoctor-reveal.js/node_modules/asciidoctor.js/dist/node/asciidoctor.js:16545
          } else { throw $err; }
                   ^
NotImplementedError: asciidoctor: FAILED: missing converter for backend 'revealjs'. Processing aborted.
    at Opal.send (/home/olivier/src/asciidoc/asciidoctor-reveal.js/node_modules/opal-runtime/src/opal.js:1610:19)
    at singleton_class_alloc.$$exception [as $exception] (/home/olivier/src/asciidoc/asciidoctor-reveal.js/node_modules/opal-runtime/src/opal.js:5344:14)
    at $Document.$$raise [as $raise] (/home/olivier/src/asciidoc/asciidoctor-reveal.js/node_modules/opal-runtime/src/opal.js:5037:31)
    at $Document.$$update_backend_attributes [as $update_backend_attributes] (/home/olivier/src/asciidoc/asciidoctor-reveal.js/node_modules/asciidoctor.js/dist/node/asciidoctor.js:6557:18)
    at $Document.$$initialize [as $initialize] (/home/olivier/src/asciidoc/asciidoctor-reveal.js/node_modules/asciidoctor.js/dist/node/asciidoctor.js:5874:16)
    at Object.Opal.send (/home/olivier/src/asciidoc/asciidoctor-reveal.js/node_modules/opal-runtime/src/opal.js:1610:19)
    at singleton_class_alloc.TMP_Class_new_5 [as $new] (/home/olivier/src/asciidoc/asciidoctor-reveal.js/node_modules/opal-runtime/src/opal.js:3501:12)
    at /home/olivier/src/asciidoc/asciidoctor-reveal.js/node_modules/asciidoctor.js/dist/node/asciidoctor.js:16511:45
    at module_constructor.$$load [as $load] (/home/olivier/src/asciidoc/asciidoctor-reveal.js/node_modules/asciidoctor.js/dist/node/asciidoctor.js:16512:28)
    at module_constructor.$$convert [as $convert] (/home/olivier/src/asciidoc/asciidoctor-reveal.js/node_modules/asciidoctor.js/dist/node/asciidoctor.js:16629:20)

Please advise @Mogztter. I know you have probably preferred I kept the node toolchain but the PR you refered me too compiled with Ruby and it didn't know how to do it in JS.

Note that right now, I copy manually build/asciidoctor-reveal.js to dist/main.js before running node test/smoke.js.

Related to #205.

[obilodeau]

Superseded by #219