Simple generation fixes

• Separated simple and complex layer configurations
• Added some basic tests
• Removed unused variables

Small fixes

v0.2.5

fixes

v0.2.3

Haven't tested on Windows or Mac.

• Base image is configurable
• Rarity checker works
• Nice console outputs
• 3 different DNA generator added: Sequential, Random and one which looks for rarity-config.json
• README still has to be checked, updated.

v0.1.8

First working version