Hanami contributors

All accuser commits

Added documentation for SRI modeassets
Added SRI attributes to test fixture manifestsassets
Added support for subresource integrity (SRI) digest for assetsassets
Ensure that async option passed to #script is either true or false.assets
Dropped options hash in favour of keyword argument for `async`.assets
Added spec for the case then `async: false` is included as an option for `#javascript`assets
Added support for 'async' attribute in javascript helperassets
Merge remote-tracking branch 'hanami/master'assets