Try to enter Nirvana after successful initial build

Without this, the board has to wait for the refresh interval to
determine that it can enter nirvana. This extracts the nirvana check and
runs it after all ajax requests finish, so it'll trigger after all jobs
have been fetched.

One comment is that this is running on `ajaxStop` because I couldn't figure out a better way of running actions after all of the individual job queries ran. My javascript fu is weak, so there is probably a better way of running actions after all jobs but I haven't figured it out yet.