Removes the need for copy by modifying lineman

- linemans server modified locally to serve both pieces:

app.use express.static("#{process.cwd()}/#{webRoot}")
app.use express.static("#{process.cwd()}")

- this is needed so requests for sourcemap source files go through
- also needed was the sourceRoot property set to '..' so the request
is formulated as /../app/js/* and /../vendor/js/*
- this is potentially hacky? maybe there's a better way
- re-enables proxy, now that i don't need copy