Fix geom::Constant float constructor.
Fix geom::Constant float constructor.

Now allows for the very reasonable usage:
auto thing = geom::Sphere() >> geom::Constant(geom::Attrib::CUSTOM_0, 1.0f);

Before, required the somewhat absurd:
auto one = 1.0f;
auto thing = geom::Sphere() >> geom::Constant(geom::Attrib::CUSTOM_0, one);

2666hz/Cinder,morbozoo/sonyHeadphones,sosolimited/Cinder,sosolimited/Cinder,2666hz/Cinder,2666hz/Cinder,sosolimited/Cinder,2666hz/Cinder,sosolimited/Cinder,morbozoo/sonyHeadphones,morbozoo/sonyHeadphones,morbozoo/sonyHeadphones