New: split MEI source into separate files for each module

commit cd5efc0dc30e857e22b74c5696eaefd27d42bcab
Author: raffazizzi <raffaeleviglianti@gmail.com>
Date:   Fri May 23 14:08:53 2014 -0400

    split files

commit ad6e224fa558223302859e17f4dc52dd2ea957c8
Author: raffazizzi <raffaeleviglianti@gmail.com>
Date:   Fri May 23 14:07:18 2014 -0400

    changed to xi:include and included new module sources

commit f647968bfafe0ab2ce35cc078d1321117e7930f3
Author: raffazizzi <raffaeleviglianti@gmail.com>
Date:   Fri May 23 14:06:57 2014 -0400

    added xml:lang elements

commit d2e00354a988d5652dd0f8301a84ed96984f68ea
Author: raffazizzi <raffaeleviglianti@gmail.com>
Date:   Fri May 23 14:06:42 2014 -0400

    split source ODD into separate files