v1.4-1: Bugfix release

Fix conversion of arrays to XML, correctly using the name of the array as tag names instead of using their indexes.
For instance, consider the following XML:

<object>
    <item>item 1</item>
    <item>item 2</item>
</object>

That XML is converted to the following lua table, where item is an array:

object = {
    item = {'item 1', 'item 2'}
}

Converting such a table back to XML was wrongly resulting in:

<object>
    <1>item 1</2>
    <2>item 2</2>
</object>

Now the conversion from the lua table returns the same XML shown at the top of this document.