Merge branch 'release/0.1.8' into develop
+ 0.1.9-1  infection and explosion animations
+ 0.1.9-2  sfx and background music
+ 0.1.9-3  message button background and Cell Survivor logo
Merge branch 'feature/animation' into develop
+ 0.1.8    animation, soundtrack, sfx and ‘Cell Survivor’ logo
Merge branch 'release/0.1.10' into gh-pages