Add Home option to Nav Menus

[LesBessant]

As mentioned in this support forum thread:

​http://wordpress.org/support/topic/394541

While it's easy enough to create a custom link with the site URL, a built-in "home" option would enable the use of the current-menu-item class.

I see this was previously requested in #12713, but as that ticket is closed, I'm adding it here - I haven't found another ticket covering it.

[14439] -- More menu improvements. Add link that adds a menu item to the home page, make empty menu dropzone slightly larger, limit selected items to the active tab. props koopersmith and ptahdunbar. see #13220.

Does not yet work for JS. I think koopersmith has an idea on how we can do that easily.

I meant non-JS. Does not work yet for non-JS. Works great for JS.

Also, as discussed with ryan and others, we need to work through the front end walker and check all custom links against the current URL for adding current-menu-item classes. That would include a Home link and any other.

(In [14457]) Check custom links, including a home link, against the current URL to see if we should add current-menu-item. props ptahdunbar, fixes #13213, see #13220.

Still not working for non-JS.

We either need to hide-if-no-js, or preferably make it a nonce link that can add it.

I'll make it work sans js

Patch lets you add a home link with no js enabled.

Tests fine, but I doubt we want to make that a button, unless we style it differently (perhaps like a link). We could do a nonce URL instead. I suppose we should ask if Jane has wanted it as something other than a link all this time, though.

Dev chat discussion led to this implementation decision: Make Home just another 'page' in the checkbox list in the pages box. That's how users think of it. No separate link at all.

UX thought -- Should we really be adding this to the top anymore? Now that it's built into Pages > View All, it makes sense to follow the normal flow. That said, as discussed in IRC, it seems we ought to differentiate it a bit anyway, maybe with an icon, or "(home)" appended in gray text, or a divider, something.

Per dev chat:
As long as Home is at the top of the checkbox list, I don't care if it adds to top in the actual menu. Is fine not to, since would be at top for a new menu, which is when it would most matter.

I don't think Home should get a different visual treatment.

(In [14971]) Move the "Add Home Link" functionality to a checkbox on the View All tab of the Pages metabox. Also makes it work non-JS. props filosofo, fixes #13213.

I just thought it might be mentioning that as a long-time WordPress user, new to 3.0, this was not at all discoverable. This is the only place I actually found the information I was looking for! And it just feels very hacked in — the way it shows up as "custom," the way it's just my URL in the URL box. I think you can do better, IMO.

Still, this new menus feature in general is wonderful. I can see myself making extensive use of it!

(I just thought it might be worth mentioning. Typo!)