Reverse dependencies for rexchange

Latest version of the following gems require rexchange

Gem	Version	Date	Downloads
vigetlabs-dockit +7.14 Thousand Downloads	`0.1.1` August 10, 2014	August 10, 2014	7.14 Thousand
reagent-dockit +6.64 Thousand Downloads	`0.1.1` August 10, 2014	August 10, 2014	6.64 Thousand
vigetlabs-amazon-ec2 +3.86 Thousand Downloads	`0.0.2` August 10, 2014	August 10, 2014	3.86 Thousand