php54-redis: require igbinary by default (follow RHEL), expand config file, sample, and fix installing --with-igbinary (thanks @myilmaz!)
php54-redis: require igbinary by default (follow RHEL), expand config file, sample, and fix installing --with-igbinary (thanks @myilmaz!)

Closes #1608.

Signed-off-by: Alan Ivey <ee249fd9166eccef852f50ca0cbb6ff8665afe99@gmail.com>

mkalkbrenner/homebrew-php,TomK/homebrew-php,philcook/homebrew-php,dguyon/homebrew-php,ablyler/homebrew-php