Historically serving assets from a mountable engine could be achieved by
running ActionDispatch::Static as a part of engine middleware stack or
to copy assets prefixed with an engine name. After introduction of
assets pipeline this is not needed as all of the assets are served or
compiled into main application's assets.
This commit removes the obsolete line making asset_path always generate
paths relative to the root or config.relative_url_root if it's set.
(closes#8119)
Add asset_path/url helper for a consolidated entry point
Expose compute_asset_path as a public API
Expose compute_asset_host as a public API
Move RAILS_ASSET_ID to its own module, AssetIdHelper
Removed AV::AssetPaths
