Reverse dependencies for buff-shell_out

Latest version of the following gems require buff-shell_out

Gem	Version	Date	Downloads
ridley +8.42 Million Downloads	`5.1.1` May 26, 2017	May 26, 2017	8.42 Million
polytrix +20.3 Thousand Downloads	`0.1.4` November 18, 2014	November 18, 2014	20.3 Thousand
omnitest +6.53 Thousand Downloads	`0.2.2` February 26, 2015	February 26, 2015	6.53 Thousand
omnitest-psychic +3.74 Thousand Downloads	`0.0.9` February 25, 2015	February 25, 2015	3.74 Thousand