Fixed head-script-disabled doesn't consider no head tag cases (head tag is optional in HTML5)

[co3k]

The current implementation of head-script-disabled treats the following HTML as an error.

<title>...</title>
<p>...</p>
<script src="..."></script>

Because the check of head-script-disabled is removed when HTMLHint is encountered with the end tag of head even if the head start tag is not presented.

[yaniswang]

Can you show me the w3c url about : head tag is optional in HTML5

[co3k]

Please read the followings:
http://www.w3.org/TR/html5/syntax.html#optional-tags

A head element's start tag may be omitted if the element is empty, or if the first thing inside the head element is an element.
A head element's end tag may be omitted if the head element is not immediately followed by a space character or a comment.

[yaniswang]

fixed: 96abbe2