Fix indentation problems in exports

All the 'code' in a custom formatter exported with Features gets indented, so that every time it is exported, it adds two spaces to the beginning, which really makes it a hassle to edit, and could actually break things, depending on the content inside the formatter.

The attached patch fixes the way the the export is generated. It also changes the format slightly. Please give it a try and generate a formatter to see what I mean.

Thanks!