Rename default to default_value for clarity
Requires libraries statically when running Opal engine
Dir.home is not implemented in Opal
Merge pull request #710 from Mogztter/opal-dirhome

Dir.home is not implemented in Opal
Merge pull request #712 from Mogztter/opal-default

Rename default to defaultValue for Opal
Merge pull request #708 from Mogztter/opal-static-lib

Requires libraries statically when running Opal engine
refactor how libraries are required

- use autoload for loading stdlib classes
- remove thread safety warning in Helpers#require_library
- add LIB_PATH constant
- remove require statements for rbx in test suite
- use absolute constant path to non-Asciidoctor classes