Edit guide link is broken after changing publish status

[durden]

The /write/ url is unique in that it requires the full path to the guide including the publish_status. This means the 'edit this guide' sidebar link can point the user to a bad URL on the first load after changing the publish status. To reproduce this do the following:

• Create new guide
• Change publish status from 'draft' to 'in-review'
• Now immediately click the 'edit this guide' link in the sidebar
• This will likely fail to find your guide and load the default information in the editor.
  • There's a race condition here actually in that if the celery task to change the publish status is not done yet things will work. However, that almost never happens in practice.

[durden]

It's worth noting that the api.api_save endpoint also has a similar race condition because it also requires the full guide path including the status.

[durden]

Other URLs use the status as a query string argument and automatically check all possible publish_status option in an intelligent order. We should probably do the same thing for views.write and api.api_save. The idea being we just pass the stack/title pair and find the guide in it's current location, then update that.

Technically there's still a race condition if we try to save a guide while the publish status task is pending or in the process of running. However, that's much more difficult to fix so we should make the easy change first.