🍺 Revise formula install
🍺 Revise formula install

- remove caveats
- add ruby dependency for sierra
- pre-install shallow clone of CocoaPods master spec repo
- use buildpath variable to get absolute path for SYMROOT

argon/mas,mas-cli/mas,mas-cli/mas,argon/mas,argon/mas,argon/mas,argon/mas,mas-cli/mas,mas-cli/mas