Add optional codesign with key

Add option:

  --sign     codesign the app directory with <keyName>              [string]

Use quotes on keyName if spaces in name.

Initial mac x86 executable release

Initial mac x86 executable release

Options:
--version Show version number [boolean]
--arm Path to the ARM directory [string] [required]
--intel Path to the Intel directory [string] [required]
--preview Preview the files that will change [boolean]
-h, --help Show help [boolean]

Fattens up a NW.js app by using an arm and intel version of the app

example usage:

fattennwjs -arm mac64-arm -intel mac64