added RedHat instalation instructions
Merge pull request #3 from burlito/patch-1

added RedHat instalation instructions
Update README.md
Corrected quiet mode

Just corrected was small typo which make inpossible to turn quet mode on and made `--quiet` switch ineffective.
Merge pull request #4 from burlito/patch-2

Corrected quiet mode
in rtmpdump creation changed ifs

changed RTMP[key].hasExist to RTMP[key].isEmpty 'cause the
RTMP["extra"] is created even if it's empty and it can produce
invalit rtmpdump syntax