5.0.0 Release

WARNING - BREAKING CHANGES

• Removed all 'mock' support
• Bound the build to only the OS upon which you are building
• Removed legacy support code
• Designed for use within a Docker environment
  • Technically, you can install and run it inside mock but it's not
    going to do any of the heavy lifting for you any longer
• Is NOT backwards compatible with anything for the most part
• Will download published packages if they are available instead of rebuilding
• Added rake task pkg:check_published
• Check required commands on build:auto