Slave output capture in the CGroups Isolate.

Adapt the slave output capture logic from the Process Isolate.
Version bump.

Version is now 0.10.4 to match the Core version. Added CGroups Isolate
support for slave output capture.
Fix bug in formating endpoint in bind() in dealer-plugin

ZMQ_LAST_ENDPOINT returns endpoint like 0.0.0.0:port, so
remote dealer couldn't connect to this endpoints.
This ip-address part is replaced by hostname.
Changelog bump.

Added information on Dealer Drivers fixes.