An early draft of a speech API

Hi all,

here is what I had in mind for speech API.
The text misses still lots of definitions, but I hope
it is still somewhat clear how it should work.
(Getting Firefox 4 done has taken most of my time.)

The main difference to the Google's API is that this isn't based on
elements, but requests objects.

For TTS we could probably use something close to what Björn just
proposed.



-Olli