add a cli command line

Usage: localenv [envFile] -- <command> [commandArgs ...]

Options:

    -h, --help     output usage information
    -V, --version  output the version number

localenv command line will load any command with
localenv computed process.env

You can either pass a custom .env file or rely on the default .env file
if any.
pin commander dependency
Merge pull request #2 from vvo/localenv-cli

add a cli command line