Can't get or push any data with "/" in the key.

Example:

Code

let data = {
    "norm_key": "data",
    "bad/key":"other data"
}

db.push("normal_key", data);
db.push("bad/key", data);

DB

{
    "normal_key": {
        "norm_key": "data",
        "bad/key":"other data"
    },
    "bad": {
        "key": {
            "norm_key": "data",
            "bad/key":"other data"
        }
    }
}

So you can create a key that has a / in it, but you can push data that does. This makes the "other data" unreachable, since by entering the key /bad/key/bad/key you’ll search for

{
    "bad": {
        "key": {
            "bad": {
                "key":"other data"
            }
        }
    }
}

That doesn’t exist

[Belphemur]

I’ve decided to do 2 things:

1. Add to the readme the limitation
2. Let the user choose the separator see #76

You’ll have control on what to use and it not conflicting with your own variable name.

[iainvm]

If this is going to be a known bug, the README.md should be updated to reflect it.