Upgrade to Box3

[theofidry]

I'm actually not sure if you were using Box 2 or Box 3, but in any case the following works with Box 3.1.

List of the changes:

• Simplify the box.json.dist config by removing the redundant settings stub and output
• Remove the directories setting of the box.json.dist config allowing Box to do the auto-discovery of the files to include. This allows Box to easily remove the dev dependencies so there is no longer a need to do a composer install --no-dev
• Simplify the make build
  • Remove the unnecessary chmod +x since the generated PHAR is already an executable
  • Remove the now unnecessary composer install --no-dev
  • Rename box build to box compile (the previous command name has been deprecated)
• Add the files generated by make build to .gitignore

[timglabisch]

thanks.