[sheepdog] Sheepdog 0.6.0 schedule and todos

[MORITA Kazutaka]

Hi all,

I think of releasing 0.6.0 at the end of this month.

Major features expected for the release are:
 - journaling to boost performance
 - sheepkeeper: yet another cluster manager for large-scale cluster
 - object reclaim based on reference counting
 - flexible options to control backend cache
 - variable object size

Let me know if there are any opinions.

Thanks,

Kazutaka