Cache: Compilation on gcc4.4 fixed
Merge pull request #364 from IIoTeP9HuY/io_stats

Cache: Compilation on gcc4.4 fixed
Merge pull request #365 from euroelessar/cache_stop

cache: Stop lifecheck thread at node->need_exit
Core: Missed error notification added
Merge pull request #366 from euroelessar/aggregated_fix

client: Make aggregated to handle empty sequence
Merge pull request #367 from IIoTeP9HuY/master

Core: Missed error notification added
client: Added capped collections