Implement http.CloseNotifier interface for gzipResponseWriter
Implement http.CloseNotifier interface for gzipResponseWriter

This seems to have been an oversight since all of the response writers
are supposed to implement this interface, but the gzipResponseWriter
didn't implement this interface for some reason.

mvadu/influxdb,apigee/influxdb,mvadu/influxdb,mark-rushakoff/influxdb,joaopedrotaveira/influxdb,jipperinbham/influxdb,pkittenis/influxdb,joaopedrotaveira/influxdb,mark-rushakoff/influxdb,chenziliang/influxdb,arussellsaw/influxdb,arussellsaw/influxdb,mark-rushakoff/influxdb,nooproblem/influxdb,apigee/influxdb,arussellsaw/influxdb,joaopedrotaveira/influxdb,mnuessler/influxdb,linearb/influxdb,daachi/influxdb,apigee/influxdb,vladlopes/influxdb,joaopedrotaveira/influxdb,influxdb/influxdb,influxdb/influxdb,mark-rushakoff/influxdb,chenziliang/influxdb,benbjohnson/influxdb,mark-rushakoff/influxdb,mvadu/influxdb,chenziliang/influxdb,jgeiger/influxdb,pkittenis/influxdb,mvadu/influxdb,mnuessler/influxdb,vladlopes/influxdb,mvadu/influxdb,mvadu/influxdb,influxdb/influxdb,jipperinbham/influxdb,runner-mei/influxdb,nooproblem/influxdb,jgeiger/influxdb,benbjohnson/influxdb,jipperinbham/influxdb,li-ang/influxdb,daachi/influxdb,nooproblem/influxdb,mnuessler/influxdb,mark-rushakoff/influxdb,runner-mei/influxdb,linearb/influxdb,benbjohnson/influxdb,jgeiger/influxdb,apigee/influxdb,li-ang/influxdb,archsaber/influxdb,jgeiger/influxdb,daachi/influxdb,vladlopes/influxdb,runner-mei/influxdb,archsaber/influxdb,jipperinbham/influxdb,pkittenis/influxdb,mnuessler/influxdb,mnuessler/influxdb,pkittenis/influxdb,apigee/influxdb,linearb/influxdb,archsaber/influxdb,influxdata/influxdb,daachi/influxdb,runner-mei/influxdb,arussellsaw/influxdb,otoolep/influxdb,influxdata/influxdb,otoolep/influxdb,linearb/influxdb,vladlopes/influxdb,otoolep/influxdb,jipperinbham/influxdb,nooproblem/influxdb,daachi/influxdb,otoolep/influxdb,arussellsaw/influxdb,influxdb/influxdb,pkittenis/influxdb,influxdb/influxdb,archsaber/influxdb,linearb/influxdb,benbjohnson/influxdb,jgeiger/influxdb,influxdb/influxdb,apigee/influxdb,jgeiger/influxdb,pkittenis/influxdb,jipperinbham/influxdb,otoolep/influxdb,arussellsaw/influxdb,otoolep/influxdb,chenziliang/influxdb,daachi/influxdb,mnuessler/influxdb,nooproblem/influxdb,joaopedrotaveira/influxdb