Reverse dependencies for horo

Latest version of the following gems require horo

Gem	Version	Date	Downloads
watchmaker +25 Thousand Downloads	`0.2.2` September 17, 2011	September 17, 2011	25 Thousand
materializer +6.83 Thousand Downloads	`0.0.1` September 17, 2011	September 17, 2011	6.83 Thousand
invoicepdf +5.39 Thousand Downloads	`0.1.4` November 21, 2010	November 21, 2010	5.39 Thousand
seedable +4.85 Thousand Downloads	`0.0.1` September 02, 2011	September 02, 2011	4.85 Thousand