add gitter badge to README.md
Merge pull request #2623 from phpnode/patch-1

add gitter badge to README.md
Report that channel is not connected if the socket is closed.
Fixed issue #2643
Issue #2632 was fixed.
(cherry picked from commit 7830a4d)
fixed document reset wrongly run deserialize
Merge branch '1.7.8' of github.com:orientechnologies/orientdb into 1.7.8
Issue #2640 - binary compatibility issue was fixed.
New test case to understand issue #2582
Fixed issue #2582 about distributed addEdge for regular edges
Minor: pre-allocated 2k of stream for serialization
Fixed issue ETL #1 (https://github.com/orientechnologies/orientdb-etl/issues/1)
OOM is thrown if memory is not allocated.
Merge remote-tracking branch 'origin/1.7.8' into 1.7.8
Fixed issue #2582
Read lock is release if socket is closed.
Merge remote-tracking branch 'origin/1.7.8' into 1.7.8
implemented script for backup database with full freeze and lvm support
Fixed issue #2659
Nothing compression avoid to copy bytes if not needed