Deserializes the script database from JSON.

def _load_db():
    """Deserializes the script database from JSON."""
    from os import path
    from pyci.utility import get_json
    global datapath, db
    datapath = path.abspath(path.expanduser(settings.datafile))
    vms("Deserializing DB from {}".format(datapath))
    db = get_json(datapath, {"installed": [], "enabled": True, "cron": False})