remove_warning in db.c
Merge pull request #2209 from charsyam/feature/remove_warning

remove_warning in db.c
Lua cmsgpack lib updated to latest version.

It fixes a bad bug that crashes the server in certain conditions
as shown in issue #2210.
Merge branch 'unstable' of github.com:/antirez/redis into unstable
Add symlink to redis-sentinel during make install
List of commands flagged as admin commands modified.

The old list did not made much sense... and the flag is currently not
used at all, so no side effects.
Don't log admin commands in MONITOR.

Otherwise there are security risks, especially when providing Redis as a
service, the user may "sniff" for admin commands renamed to an
unguessable string via rename-command in redis.conf.
CONTRIBUTING updated.