- fixes #85 :
 * now bom data gets correctly generated/fetched even when using background processing
 * this is done via a small hack passing part id and class name through the process of packing/unpacking data fetched from inside the webworker
doing the background processing
 * also, now the correct list of part variants are displayed in the bom exporter view
 * small cleanup of bom exporter spec
 * added additional test for background compilation + bom data generation
- removed some console.log entries, way too verbose