Revert "Bail out on indexed color images in OSX reader"
Revert "Bail out on indexed color images in OSX reader"

This reverts commit 512a024b25ac564718f1b82c6d8ef1e0518784b4.

rened/Images.jl,cdsousa/Images.jl,rened/Images.jl,twadleigh/Images.jl,zhmz90/Images.jl,angi2/Images.jl,timholy/Images.jl,benmoran/Images.jl,JuliaPackageMirrors/Images.jl,zhmz90/Images.jl,c42f/Images.jl,c42f/Images.jl,angi2/Images.jl,benmoran/Images.jl,cdsousa/Images.jl,twadleigh/Images.jl