namespace default segment and token elements by default

[balmas]

with plain text (and maybe or non-namespaced xml input, not sure), the default s and w elements in the segtok output is not namespaced. I think since the defaults are explicitly TEI tags, the service should always namespace them in the TEI namespace. This will ensure consistent results regardless of the input.

[balmas]

was thinking to fix this while working on the support for POST but after looking at the code, I think I'll wait. Really probably ought to switch to using a namespace-aware XML library for working with the XML - fixes to the current code would be horribly hackish.