Refactored settings script to use generic app names.
Refactored settings script to use generic app names.

- This refactor demonstrates that the app names have no true purpose
  anymore and can be named anything.
- The goal is to remove all *_APP_FILE keys from settings.sh in the
  future and auto-calcuate the app name (i.e. use a temp file)
  instead.

stevenqzhang/osx,empty23/osx,BecomingCoder/osx,masterots/osx_setup,empty23/osx