Modified translucent butterfly necklace

A remix of Austin Reid's necklace (http://www.thingiverse.com/thing:543889):
- moved the attachment holes to inside the butterfly's wings
- Fixed an issue where the rib of the top wings would not print due to too small size.
- Increased the translucent part's thickness to 4 layers instead of 1, this prevents z-leveling plowing / slicing strategy to show through

Also prints very nice when doing a material swap after the first 4 layers, as for instance in ericchf's design: http://www.thingiverse.com/thing:552835/