Reverse dependencies for ffi_dry

Latest version of the following gems require ffi_dry

Gem	Version	Date	Downloads
ffi-pcap +12.4 Thousand Downloads	`0.2.1` February 10, 2013	February 10, 2013	12.4 Thousand
marquise +10.5 Thousand Downloads	`0.2.0` March 27, 2014	March 27, 2014	10.5 Thousand
dnet-ffi +10.4 Thousand Downloads	`0.1.4` January 03, 2010	January 03, 2010	10.4 Thousand
ffi-packets +6.18 Thousand Downloads	`0.1.0` January 03, 2010	January 03, 2010	6.18 Thousand
caper +6 Thousand Downloads	`0.2.0` April 21, 2010	April 21, 2010	6 Thousand