- Added helper app to generate test data (random sprites).
- Changed directory structure to accomodate helper app
Merge branch 'develop' of https://github.com/nicolas-miari/Spritesheet-Packer into develop

# By Nicolás Miari
# Via Nicolás Miari
* 'develop' of https://github.com/nicolas-miari/Spritesheet-Packer:
  Update README.md
  Update README.md