Brimmable fixed hairclip

A modified version of the "fixed" hairclip at http://www.thingiverse.com/thing:44885. This adds a tiny cube to "dam" the opening so you can print with a brim to keep it from curling up, but not have the brim flood the inside of the clip. Used netfabb to pick off the position of interesting triangles in the original part to determine where to put the dam.