[MSE] Spec updates published

Hi,

I just wanted to let people know I've updated the Media Source Extensions
again today.

Summary of changes:
Primarily clarification bug fixes.

- Clarified requirements for WebM byte streams (Bug
18602<https://www.w3.org/Bugs/Public/show_bug.cgi?id=18602>
)
- Clarified that SourceBuffer.buffered should return a new object every
time. (Bug 18593 <https://www.w3.org/Bugs/Public/show_bug.cgi?id=18593>)
- Clarified addsourcebuffer and removesourcebuffer event targets.(Bug
18591<https://www.w3.org/Bugs/Public/show_bug.cgi?id=18591>
)
- Clarified where in the resource fetch algorithm the media source
attaching occurs.(Bug
18588<https://www.w3.org/Bugs/Public/show_bug.cgi?id=18588>
)

Bug 18576 <https://www.w3.org/Bugs/Public/show_bug.cgi?id=18576>
- Clarified text for duration updates triggered by appending past the end.
- Removed section 2.12 since it was non-normative.
- Created a new normative duration change algorithm. (Section 3.3.6)
- Updated append(), endOfStream(), & duration setter algorithms to use the
new duration change algorithm.


Diffs: http://dvcs.w3.org/hg/html-media/rev/340786fcae83

Aaron