Updated libpng and added wget. (firefly-iii/firefly-iii#1443)
Updated libpng and added wget. (firefly-iii/firefly-iii#1443)

firefly-iii/firefly-iii,firefly-iii/firefly-iii,JC5/firefly-iii,JC5/firefly-iii,firefly-iii/firefly-iii,firefly-iii/firefly-iii