Locating assets

I believe that there are scenarios where it is useful to have a route such as the following:

    <link rel='stylesheet' href='@routes.WebJarAssets.at("css/bootstrap.min.css", locate=true)'>

i.e. where a WebJar asset is located and then retrieved. The above is functionally equivalent to:

    <link rel='stylesheet' href='@routes.WebJarAssets.at(WebJarAssets.locate("css/bootstrap.min.css"))'>

Things like the following then also become possible in routes files:

    GET     /stylesheets/bootstrap.css  controllers.WebJarAssets.at(file="css/bootstrap.min.css", locate=true)

...which is useful for when not using templates.