Merge pull request #184 from danberindei/t_DISCARD

Make DISCARD collections thread-safe + Keep track of ignored members even when they're not in the view any more
Sending cache information to others if discovery protocol is static and coord and enabled (https://issues.jboss.org/browse/JGRP-1903)
pp for Probe
Added accessors for custom log factory
NAKACK2: added resend_last_seqno flag (https://issues.jboss.org/browse/JGRP-1904)