comm-central is now approval required

Hi folks,

Multiple people have been landing patches affecting Thunderbird (inc 
Lightning) on comm-central without starring previous failures, and 
ensuring there were no new permanent failures.

There has been one new permanent failure, plus another one I'd say was 
suspect.

We must be tracking these, to ensure we're not getting new failures in. 
Whilst staring is a pain, if we get too many failures, we'll need to 
close the tree completely until we get those resolved.

That's something I've been trying to avoid. As a result of the lack of 
starring, we are now on approval required.

Before requesting approval from jcranmer or myself, please ensure all 
previous oranges have been starred before requesting approval - if there 
are new oranges, or oranges without a bug, they need investigation and 
backout or bugs filing/fixing, before landings can continue.

Mark.