update package.json to use color-vision instead of example-sim
make solid beam slightly transparent
fix issue #66 by changing all photons to color of beam when switching views
revert commit fdd3e627d446539fe62bd7889cb8d7887c16a035, see #66
fix transparency of white beam
increase icon size
center icons around flashlight after making them larger, see #71
give deselected icons 0.5 opacity, see #71
center head toggle buttons on no brain head, see #71
make some adjustments to beams in single bulb screen; fix #72
add rectangles around wavelength sliders, see #73
Revert "add rectangles around wavelength sliders, see #73"

This reverts commit 4284b9cf4a8cb83824aba327af729c8e3e569c3d.
add outline around wavelength sliders, see #73
layer solid beam between head nodes, see #68
modify head-front image, see #68
fix beam alpha, see #68
fix comment typo
add new flashlight images and adjust code to accomodate, see #69
add new head artwork, see #70
update icon images, make icons bigger, see #70