ENH: Add "Approve all" button for pet name approval

[HailStorm32]

Add a button to the Unapproved Items page that allows the user to approve all unapproved pet names.

Would be easier to go though and reject the bad names then mass approve the good ones.

[bgstack15]

I think I could do this, by using javascript on the client side, so that an "approve all" button would send XHR for each "approve this" button on the page. Or would you be interested in having an "approve all" endpoint that this new button would POST?