further optimizations for the multi bulk protocol parsing code when big objects are transmitted to Redis.

sdsIncrLen() / sdsMakeRoomFor() used to avoid copying to intermediate buffer while reading the client query.

sdsMakeRoomFor() exposed as public API. sdsIncrLen() added. Both the changes make it possible to copy stuff from a system call to an sds buffer without the need of an additional buffer and copying overhead.

build: fix sunos build, compile lua with __C99FEATURES__=1

maxclients configuration is now implemented dealing with the actual process rlimits. Setting maxclients to 0 no longer makes sense and is now invalid, the new default is 10000.
See issue #162 for more information.

It is now possible to disable password authentication via CONFIG SET. Thanks to Jan Oberst. This closes issue #171.

If a Lua script executes for more time than the max time specified in the configuration Redis will log a warning, and will start accepting queries (re-entering the event loop), returning -SLOWSCRIPT error for all the commands but SHUTDOWN that remains callable.

Clear the AOF rewrite scheduled flag once an AOF rewrite is triggered. Fix for issue #161, probably fixing 159 as well.

A past commit removed the inclusion of redis.h from rdb.c, completely breaking 32 bit builds under Linux.

Redis.call is now split into two variants of the same function. Redis.call will raise an error by default. Redis.pcall will return the error object instead.

Cleaned up redis root directory a tiny bit and changed links to github issues