- updated /added "boilerplate" Licence, readme, package & bower files etc
- added a cleaner implementation, for now based on the three.js stl exporter (with a few changes),
while keeping some of the older code as reference , for upgrading
 * added tests
 * added test data (expected files)
- work done on binary stl serialization : not functional just yet
- overall code cleanup/restructuring
- updated expected file for serialized hierarchy