Add reading/saving of current layout to URL

[kittsville]

The app URL should include the current layout's slug. When the site is visted the slug should be read and, if the layout exists, that layout should be switched to.

Some fancy stuff using history push state could be used but the simplest way would just do the above. Any implementation that did use push state should try to keep Chomskey gracefully deprecating and disabling that functionality on init if not supported.

While this would be useful, there are (currently) much more important issues to be solved.

[kittsville]

This would actually be really useful for development, removing low-priority tag.

[kittsville]

This is definitely coming next after #7. It's getting very tiresome to use that dropdown after every minor change.

[kittsville]

Unfortunately the # can't be removed once it's been added. I could look into using .htaccess to resolve non-'assets' directories to layout parameters to pass to Chomskey and use HTML5 history pushstates to update the URL as the layout is changed without reloading the page, but that seems like a lot of effort for little gain.

I'm tempted to close this issue as is. I'll leave it open to ponder on.