Reverse dependencies for ruby-growl

Latest version of the following gems require ruby-growl

Gem	Version	Date	Downloads
rspec-notify +4.31 Thousand Downloads	`0.0.1` November 14, 2013	November 14, 2013	4.31 Thousand
duwanis-burble +4.11 Thousand Downloads	`0.1.1` August 11, 2014	August 11, 2014	4.11 Thousand
hatebu_watcher +3.85 Thousand Downloads	`0.0.1` January 23, 2015	January 23, 2015	3.85 Thousand
rspec-notify-documentation-format +3.82 Thousand Downloads	`0.0.1` May 17, 2014	May 17, 2014	3.82 Thousand
timer_cli +3.76 Thousand Downloads	`0.0.1` January 23, 2015	January 23, 2015	3.76 Thousand