OptiFine 1.8.4_HD_U_D6
 - fixed red screen tinting
 - fixed invisible mobs
 (30.06.2015)
OptiFine 1.8.4_HD_U_D5
 - added support for RandomMobs property files (biome, height, weight) 
 - fixed transparent textures with alpha < 16
 (24.06.2015)
OptiFine 1.8.4_HD_U_D4
 - updated to Minecraft 1.8.4
 (28.04.2015)
