Use the blessed CLI strategy in bert_server and ner-server

[evanmcclure]

Closes #26

[evanmcclure]

Console output that shows the usage of the bert_server now follows.

Top-level help message:

$ ./bert_server
NAME:
   bert_server - A demo for question-answering based on BERT.

USAGE:
   bert_server [global options] command [command options] [arguments...]

COMMANDS:
   run      Run the bert_server.
   help, h  Shows a list of commands or help for one command

GLOBAL OPTIONS:
   --help, -h  show help

Command help message

$ ./bert_server help run
NAME:
   bert_server run - Run the bert_server.

USAGE:
   bert_server run --model=<path> [--address=<address>] [--tls-cert-file=<cert>] [--tls-key-file=<key>] [--tls-disable]

DESCRIPTION:
   Run the bert_server indicating the model path (NOT the model file).

OPTIONS:
   --address value          Changes the bind address of the server. (default: "0.0.0.0:1987")
   --model value, -m value  The path of the model to load.
   --tls-cert-file value    Specifies the path of the TLS certificate file. (default: "/etc/ssl/certs/spago/server.crt")
   --tls-key-file value     Specifies the path of the private key for the certificate. (default: "/etc/ssl/certs/spago/server.key")
   --tls-disable            Specifies that TLS is disabled.

[evanmcclure]

The output of the usage of the ner-server is now shown.

Top-level help message:

$ ./ner-server 
NAME:
   ner-server - A demo for named entities recognition.

USAGE:
   ner-server [global options] command [command options] [arguments...]

COMMANDS:
   run      Run the ner-server.
   help, h  Shows a list of commands or help for one command

GLOBAL OPTIONS:
   --help, -h  show help

Command usage:

$ ./ner-server help run
NAME:
   ner-server run - Run the ner-server.

USAGE:
   ner-server run --model=<model-name> [--models=<path>] [--port=<port>]

DESCRIPTION:
   You must indicate the directory that contains the spaGO neural models.

OPTIONS:
   --port value        Specifies the port to bind the server to. (default: 1987)
   --models value      Specifies the path to the models. (default: "/Users/emcclure/.spago")
   --model-name value  Specifies the name of the model to use.