We should remove our "Thinkful" mood
We currently supports a "thinkful" mood that IS NOT in XEP.
I think we should remove it, even if we add our namespace, because:
- it is not supported correctly by other programs ( http://flyspray.psi-im.org/task/877 )
- It's the first release when we use mood
- it is a "recent-implemented" feature on servers and clients
- moods should be "universal": this is a non-sense to add moods on our own namespace...
and... we always try to get closer to he XEP's... why not here?