Reverse dependencies for ninja

Latest version of the following gems require ninja

Gem	Version	Date	Downloads
integrity-bob +9.35 Thousand Downloads	`0.3.1` August 11, 2014	August 11, 2014	9.35 Thousand
transporter +5.32 Thousand Downloads	`0.1` August 18, 2009	August 18, 2009	5.32 Thousand
jeroenvandijk-bob +4.01 Thousand Downloads	`0.3.1` August 11, 2014	August 11, 2014	4.01 Thousand