Reverse dependencies for jsonbuilder

Latest version of the following gems require jsonbuilder

Gem	Version	Date	Downloads
acts_as_serializable +50.1 Thousand Downloads	`0.3.0` November 15, 2012	November 15, 2012	50.1 Thousand
coalmine +22.6 Thousand Downloads	`0.5.3` April 29, 2012	April 29, 2012	22.6 Thousand
birkirb-acts_as_serializable +21 Thousand Downloads	`0.1.6` August 11, 2014	August 11, 2014	21 Thousand