Update the WHATWG HTML spec URL
Include more useful links in the header

Update ReSpec to v3.2.24 to support this for the CG spec:
https://github.com/w3c/respec/pull/348

Remove the now redundant bug link from the abstract.
Merge pull request #133 from foolip/header-links

Include more useful links in the header
Merge pull request #131 from foolip/html-ref

Update the WHATWG HTML spec URL
Add wrapping <dl> to the lineAlign steps

This was invalid markup, introduced in
https://github.com/w3c/webvtt/pull/116
Merge pull request #135 from foolip/wrap-dl

Add wrapping <dl> to the lineAlign steps
Merge commit '6a123f490969eb1ee2d420e665187e8732b94432' into position-size-align
Merge commit 'f90aa945151fc5adad84e30b891b9d6e04aa1c92' into position-size-align

Conflicts:
	webvtt.html