Make it easy to override the way we get the href

[webmat]

First of all, thanks for providing us with jquery_ujs!

I'd like it if jq_ujs provided an easy way to override how it gets the href from an element. Just like we can override the ajax call. I've seen issue #4, but my suggestion is coming from a different place.

10s background: I'm currently working with jQuery Mobile and jquery_ujs. They recently started messing around with the href on touch devices, in order to keep iOS from displaying the address bar. They tuck it away in a data-href attribute.

So if jq_ujs could let me override the way it gets an element's href, I could deal with this situation gracefully. I'm sure other frameworks do (or will) use the same kind of trick to keep the address bar from appearing. So I think it makes sense to include this feature in jquery_ujs. What do you think?

Let me send you a pull request, for my implementation...

[webmat]

With my patch in place, it's now possible to override $.rails.href() like so:

$.rails.href = (element)->
  href      = element.attr('href')
  data_href = element.jqmData('href')
  if (href == '#' || !href) && data_href
    return data_href
  else
    return href

Which will be called in handleRemote (for a link) and handleMethod.

[webmat]

Fixed and merged.