Reverse dependencies for polling

Latest version of the following gems require polling

Gem	Version	Date	Downloads
fluent-plugin-snmp +51.3 Thousand Downloads	`0.0.9` August 07, 2016	August 07, 2016	51.3 Thousand
fluent-plugin-http-status +16.2 Thousand Downloads	`0.0.4` April 17, 2013	April 17, 2013	16.2 Thousand
superhosting +5.56 Thousand Downloads	`0.0.2` April 12, 2016	April 12, 2016	5.56 Thousand