added computer parsable output to redis-cli

Hello,

I have added new cmdline switch -b (bare format) to the redis-cli. It then prints out results in "bare format", which is almost raw, except there are newlines after each reply/set/list entry etc. This format is easily parsable by e.g. shell scripts, where you can read things line by line. 

I have also changed help printout: now it prints help also on help command (& doesn't try to connect to redis first) and I have also replaced -iv with -vb in the usage(), so that it doesn't list deprecated switch anymore, but the new one instead.

See the changes yourself. I hope redis-cli will finally have parsable output...

BTW., there's maybe a bug in the new redis-cli implementation (that of 2.0.4 works fine) - when I have multi line string and retrieve it via get, it doesn't print \n instead of newlines, but only \ (maybe this is intention)

Best regards,

m. tekel