Use more compatible gzip write api instead of "<<".
Use more compatible gzip write api instead of "<<".

Fixes undefined method `<<' for Zlib::GzipWriter on JRuby
Codeman655/rack,imtayadeway/rack,nmk/rack,imtayadeway/rack,ktheory/rack,nmk/rack,rwz/rack,chneukirchen/rack,keithduncan/rack,arronmabrey/rack,wildjcrt/rack,getaroom/rack,trexnix/rack,shaneog/rack,gioele/rack,sigmavirus24/rack,sigmavirus24/rack,davydovanton/rack,rwz/rack,Eric-Guo/rack,arronmabrey/rack,fabianrbz/rack,ngpestelos/rack,jackxxu/rack,rkh/rack,wildjcrt/rack,davydovanton/rack,eins78/rack,supzann3/rack,fabianrbz/rack,krainboltgreene/lack,eins78/rack,liamseanbrady/rack,chneukirchen/rack,ngpestelos/rack,stepri/rack,x-team/rack-cgmasters,Codeman655/rack,Codeman655/rack,laplaceliu/rack,supzann3/rack,wjordan/rack,joevandyk/rack,ganmacs/rack,lgierth/rack,keepcosmos/rack,gioele/rack,jackxxu/rack,Comcast/rack,AMekss/rack,deepj/rack,jeremyf/rack,zjsxwc/rack,davidcelis/rack,ganmacs/rack,getaroom/rack,travis-repos/rack,wjordan/rack,Eric-Guo/rack,wjordan/rack,eavgerinos/rack,eavgerinos/rack,gfvcastro/rack,AMekss/rack,wildjcrt/rack,davidcelis/rack,evanphx/rack,ganmacs/rack,Eric-Guo/rack,jhodder/rack,zjsxwc/rack,gfvcastro/rack,maclover7/rack,akihiro17/rack,sigmavirus24/rack,getaroom/rack,Comcast/rack,maclover7/rack,jeremyf/rack,akihiro17/rack,laplaceliu/rack,evanphx/rack,liamseanbrady/rack,evanphx/rack,nmk/rack,tylergannon/rack,rkh/rack,AMekss/rack,akihiro17/rack,deepj/rack,tricknotes/rack,supzann3/rack,ktheory/rack,maclover7/rack,eavgerinos/rack,jeremyf/rack,Comcast/rack,trexnix/rack,zjsxwc/rack,rwz/rack,stepri/rack,arronmabrey/rack,tylergannon/rack,keepcosmos/rack,keithduncan/rack,tylergannon/rack,fabianrbz/rack,laplaceliu/rack,trexnix/rack,tricknotes/rack,gfvcastro/rack,liamseanbrady/rack,davydovanton/rack,paulrogers/rack,shaneog/rack,shaneog/rack,chneukirchen/rack,keepcosmos/rack,ngpestelos/rack,jackxxu/rack,wycats/rack,davidcelis/rack,gioele/rack,keithduncan/rack,eins78/rack,stepri/rack,imtayadeway/rack,deepj/rack