title: Verbose Output From rake assets:precompile
body: <p>I've just started using the asset_sync gem and my assets seem to be being compiled out of order, with Sass files unabled to access variables defined in other Sass files. What would really help me narrow down the issue is being able to see exactly what is going on during precompilation, but both <code>rake assets:precompile</code> and <code>heroku run rake assets:precompile</code> doesn't seem to offer a verbose option. All I get is some higher level output followed by a <code>rake aborted!</code> and a stack trace. Tailing heroku logs gets me nothing, so how can I get a more detailed log of what is going on during asset precompilation on Heroku?</p>