[MSE] Spec updates published

Hi,

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:

Bug 18578 <https://www.w3.org/Bugs/Public/show_bug.cgi?id=18578>
- Removed the special handling for empty sourceBuffers in
removeSourceBuffer() algorithm since it redundant with the "not found" case.

Bug 18589 <https://www.w3.org/Bugs/Public/show_bug.cgi?id=18589>
- Updated failed attach text run the "If the media data cannot be fetched
at all ..." steps of the resource fetch algorithm.

Bug 18633 <https://www.w3.org/Bugs/Public/show_bug.cgi?id=18633>
- Fixed addsourcebuffer & removesourcebuffer event links.

Bug 18708 <https://www.w3.org/Bugs/Public/show_bug.cgi?id=18708>
- Updated append() algorithm to transition from "ended" to "open" and fire
a sourceopen event.

Bug 18634 <https://www.w3.org/Bugs/Public/show_bug.cgi?id=18634>
- Updated detach algorithm to only fire removesourcebuffer once when all
the SourceBuffers are removed.
- Added steps for activeSourceBuffer to detach algorithm.
- Added missing "queue a task to fire and event named ..." steps to various
steps in section 3.3.5.

Diffs: http://dvcs.w3.org/hg/html-media/rev/7bab66368f2c

Aaron