Merge pull request #259 from euroelessar/master

Client: Some fixes connected with move semantic
Stat: In eblob statistics used DNET_CNTR_NODE_FILES for number of available records in eblob.
Stats: Updated DNET_CNTR_NODE_FILES comments. Renamed unused counters to DNET_CNTR_RESERVED
Merge pull request #260 from shaitan/master

Stat: In eblob statistics used DNET_CNTR_NODE_FILES for number of availa...
io_client: Call wait() to async_remove_result