Reverse dependencies for spawn

Latest version of the following gems require spawn

Gem	Version	Date	Downloads
phocoder-rails +85.6 Thousand Downloads	`0.0.58` March 10, 2013	March 10, 2013	85.6 Thousand
shield-contrib +12.8 Thousand Downloads	`0.0.3` January 02, 2011	January 02, 2011	12.8 Thousand
mm-data_mapper +10.5 Thousand Downloads	`0.0.3` April 18, 2014	April 18, 2014	10.5 Thousand
universe-common +5.27 Thousand Downloads	`0.1.1` January 12, 2011	January 12, 2011	5.27 Thousand