Implementing --host flag for production.

[CoolDeveloper101]

This allows the user to change the hostname in production mode -

Start the app in production mode

Usage:
    aleph start <dir> [...options]

<dir> represents the directory of the aleph.js app,
if the <dir> is empty, the current directory will be used.

Options:
    --host           The address at which the server is to be started.
    -p, --port       A port number to start the aleph.js app, default is 8080
    -L, --log-level  Set log level [possible values: debug, info]
    -r, --reload     Reload source code cache
    -h, --help       Prints help message

Usage -
aleph start --host <hostname> <project>

[ije]

look great, thanks @CoolDeveloper101

[shadowtime2000]

lgtm, merging since ije approved too