[MSE] Spec updates published

I've just posted more changes to the Media Source
Extensions<http://dvcs.w3.org/hg/html-media/raw-file/tip/media-source/media-source.html>
 spec.

Summary of the changes since the last time I sent out an email:

- Converted MSE spec to ReSpec.

- Added transition to HAVE_METADATA when current playback position is
removed. (Bug 18709 <https://www.w3.org/Bugs/Public/show_bug.cgi?id=18709>)

- Add remove() calls to duration change algorithm. (Bug
18587<https://www.w3.org/Bugs/Public/show_bug.cgi?id=18587>
)

- Added MediaSource.isTypeSupported() method. (Bug
19531<https://www.w3.org/Bugs/Public/show_bug.cgi?id=19531>
)

- Remove initialization segments are optional text. (Bug
18601<https://www.w3.org/Bugs/Public/show_bug.cgi?id=18601>
)

Diffs:
http://dvcs.w3.org/hg/html-media/rev/3e4d27b3a98f - ReSpec conversion.
http://dvcs.w3.org/hg/html-media/rev/0c638da9a67a - The rest.

Aaron