Wrong problem description for Exercise 3

[DCrow]

This description is wrong:

Your module could look like:
module.exports = function (databaseDir, callback) {
    var result = []
    // your code...
    result.push()
    // more code...
    callback(result)
}

Original description, asks that callback(result) is invoked using one parameter, but it actually requires two callback(error, result)

Description should be:

Your module could look like:
module.exports = function (databaseDir, callback) {
    var result = []
    // your code...
    result.push()
    // more code...
    callback(error, result)
}

[martinheidegger]

Duplicate of #96