Change $window gvar to $global (change in Opal reference)
Update to new Native api in Opal
Update submodule to asciidoctor master
Update submodule
build enhancements

- use Sprockets to write file
- enable minify and compress for JavaScript
- formatting
example improvements

- update sample AsciiDoc
- set charset in HTML
- update stylesheet
- use latest attribute names
- print timings
- set HOME environment variable
Merge pull request #1 from mojavelinux/build-enhancements

build enhancements
Merge pull request #2 from mojavelinux/example-update

example improvements
document how to debug errors using browser console
Merge pull request #3 from mojavelinux/debugging-howto

document how to debug errors using browser console
Replace sub! and gsub! at build time
Add Asciidoctor-backends as a submodule
Uses opal-sprockets master
Require native (moved to the stdlib) and unwrap native function
add note about starting Chrome with cache disabled
update example
pin to releases of opal and opal-sprockets
only write changes to Asciidoctor source files once
switch to upstream repo of Asciidoctor; update submodules
update dist