Missing remove()

[geraintluff]

Hi - I just started using your library for something, and I realised I can get(), and I can set(), but I'd like to be able to remove().

Any chance of putting that in?

[geraintluff]

In case it's useful, this is my current polyfill:

jsonPointer.remove = jsonPointer.remove || function (obj, path) {
    var parts = this.parse(path);
    var finalProperty = parts.pop();
    var parent = parts.length ? this.get(obj, this.compile(parts)) : obj;
    delete parent[finalProperty];
    return this;
};

[geraintluff]

FYI - the parts.length check is because of issue #4.

[manuelstofer]

Good point! A delete method is definitely useful.