Define a config file in JSON format to launch PADE runtime environment

[lucassm]

The idea here is to define a clear pattern to configure the PADE runtime environment by means of a config file using the JSON format.

An example of such a configuration file is the following json code:

{   
    "agent_files": [
        "agent_example_1.py",
        "agent_example_3.py"
    ],
    "port": 20000,
    "num": 2,
    "pade_ams": {
        "launch": true,
        "host": "localhost",
        "port": 8000
    },
    "pade_web": {
        "active": true,
        "host": "localhost",
        "port": 5000
    },
    "pade_sniffer": {
        "active": true,
        "host": "localhost",
        "port": 8001
    },
    "session": {
        "username": "pade_user",
        "email": "pade_user@pade.com",
        "password": "12345"    
    }
}