phoenix.Matrix; Typo in up function

[ntrf]

Method up reports wrong data. There is a typo in the source code - wrong matrix component returned:

    public inline function up() {
        return new Vector( elements[4], elements[5], elements[10] );
    } //up

Z coordinate sould be elements[6] instead of elements[10].

[ruby0x1]

Well spotted, the new maths classes in embers have unit tests to validate silly things like this. Thanks!