TTML Verifier Tool

I have an action (286) to inform this list of the TTV hosting site at W3C
[1], which it turns out is currently broken, and will require some work
with W3C IT to get fixed.

In the mean time, a backup (and working) site is available at [2]. For
those interested in source code, see [3].

[1] http://validator-test.w3.org/ttml
[2] http://www.skynav.com:8080/ttv/verify
[3] http://github.com/skynav/ttv