Fixed some subtle bug in the command processing code almost impossible to spot in the real world, thanks to gcov

Changed the reply of BGSAVE and BGREWRITEAOF from +OK to a more meaningful message that makes the user aware of an operation that just started and is not yet finished.

Set the master->slave logical client as authenticated on creation, so that if the slave requires a password replication works anyway

better handling of non blocking connect on redis-benchmark: EPIPE on read does not print an error message now

some change to redis-sha1.rb utility to make it more robust against non-meaningful changes in the dataset

a bit more verbose -ERR wrong number o arguments error, now gives info about the command name causing the error

Fixed daemonization when using kqueue/kevent. Now the server initialization is performed *after* the daemonization

use __attribute__ format in sdscatprintf() when the compiler is GCC. Fixed format bugs resulting from the new warnings.

Fixed issued #85 (getDecodedObject: Assertion 1 != 1 failed. While sorting a set), added a smarter assert() function to dump the stacktrace, provided a macro to initalize Redis objects on the stack to avoid this kind of bugs.

enable kqueue/kevent only for Mac OS X 10.6.x as it seems that 10.5.x has a broken implementation of this syscalls.