Merge branch 'release-1.0beta-refresh' of https://github.com/skysql/MaxScale into release-1.0beta-refresh
First changes for fixing #548, http://bugs.skysql.com/show_bug.cgi?id=548
dcb.c:dcb_process_zombies:added new parameter which tells what DCB the thread will use after calling dcb_process_zombies. Thus, processing that DCB is skipped.
readwritesplit.c:routeQuery:removed double free call for query buffer.