[Development] Updating third-parties

[Qi Liang]

> Actually, the merges are already happening, so 5.1 *is* feature frozen.
>
> Please target your updates to stable if you're updating within minor (non-
> feature) releases of your third-party or if you're fixing important bugs.
>
> Updates for the sake of update should be in dev and will wait for 5.2.

The BIG merges for every modules have started, some are finished.

Then this "Updating" notice doesn't have much meaning in this very short periode. I would suggest only important bug fix should go into stable branch. All general updates should happen in dev branch after the frozen. Better to happen 1 or 2 months before next BIG merges, sth like July or August, I guess.

Regards,
Liang