Make external hash checker an option

[gjtorikian]

Some websites, like Travis and https://enterprise.github.com/faq, use JavaScript to generate header links for the TOC. This screws up the newly introduced external hash checker, so let's move that into an option.

You can always explicitly ignore an href with href_ignore, but you shouldn't have to create an ignore if you don't want to.

[parkr]

I guess html proofer was doing its job! It caught a call to a non-html link. Would it be possible to use natural html anchor tags there rather than javascript?

[gjtorikian]

For enterprise's website, sure. For Travis, I don't work there. 😉 No idea why you wouldn't generate the HTML anchor yourself. There are some things JS is good at and some that are just overkill.

[parkr]

OK :) I guess this is a situation where I feel html proofer is doing its job and the sites should be updated, but that's just my personal opinion. More generally, where do we modify html proofer to suit our websites and where do we say "this is how html should be and when it should be a certain way, if you want to use html proofer, you have to abide by these (W3C-related) rules"? #existentialcrisis