Refactored jslab_dynamic to jslab_tags, and the dynamic_asset tag to just plain 'asset'. Oddly, there is no default tag with that name. I thought about naming my version 'dynamic', but asset is just more to the point.
Added one missing template fragment to the changeover from jslab_dynamic plus dynamic_asset to jslab_tags plus asset.
Added Procfile and runtime for use on Heroku. Also changed settings files for use on Heroku.
Modified path to custom storage classes.