remove references to deprecated Ember.Set
remove references to deprecated Ember.Set

jkarsrud/guides,aceofspades/guides,bmac/guides,bmac/guides,szines/guides,thriqon/guides,SaladFork/emberjs-guides,aceofspades/guides,toranb/guides,omni5cience/guides,danielgynn/guides,webPapaya/guides,kevinkucharczyk/guides,greyhwndz/guides,talhaobject90/guides,TRMW/guides,bmac/guides,skaterdav85/guides,kublaj/guides,boztek/guides,gpluta/guides,richardkalehoff/guides,xymbol/guides,balupton/guides,HeroicEric/guides,misfo/guides,grapho/guides,andrewstarks/guides,MarkMT/guides,nicobot/guides,misfo/guides,RalfWeinand/guides,mallikarjunayaddala/guides,thriqon/guides,HeroicEric/guides,rengokantai/guides,vikram7/guides,ear/guides,kellywerks/guides,mikzar/guides,kagemusha/guides,alexspeller/guides,josenberg/guides,benjaminokeefe/guides,Kuzirashi/guides,foxnewsnetwork/guides,gpluta/guides,jcagener/guides,jackfranklin/guides,bmac/guides,gregzx/guides,dgeb/guides,talhaobject90/guides,anthias/guides,josenberg/guides,josephchappell/guides,foxnewsnetwork/guides,skaterdav85/guides,vikram7/guides,zacharywelch/guides,davidpett/guides,ankushagarwal/guides,MarkMT/guides,jcagener/guides,skaterdav85/guides,gpluta/guides,mcfiredrill/guides,jkarsrud/guides,mikzar/guides,jjhampton/guides,boztek/guides,richardkalehoff/guides,foxnewsnetwork/guides,constantm/guides,jjhampton/guides,grapho/guides,MSch/guides,tildeio/guides,szines/guides,dgeb/guides,Kuzirashi/guides,josenberg/guides,TRMW/guides,dgeb/guides,earthrid/guides,SaladFork/emberjs-guides,zacharywelch/guides,ear/guides,ubuntuvim/guides,benoittgt/guides,mallikarjunayaddala/guides,jkarsrud/guides,ofridagan/guides,kellywerks/guides,tleskin/guides,toranb/guides,danielgynn/guides,balupton/guides,RalfWeinand/guides,grapho/guides,earthrid/guides,constantm/guides,szines/guides,greyhwndz/guides,nicobot/guides,odarbelaeze/guides,odarbelaeze/guides,papilip/emberjs-guides-french,benoittgt/guides,MarkMT/guides,timrosenblatt/guides,Joelkang/guides,earthrid/guides,kublaj/guides,webPapaya/guides,greyhwndz/guides,JKGisMe/guides,ofridagan/guides,balupton/guides,coffeejunk/guides,talhaobject90/guides,Kuzirashi/guides,richardkalehoff/guides,mendeza428/guides,jackfranklin/guides,gregzx/guides,ear/guides,ubuntuvim/guides,benoittgt/guides,jcagener/guides,ubuntuvim/guides,benjaminokeefe/guides,MarkMT/guides,tildeio/guides,mallikarjunayaddala/guides,jkarsrud/guides,gerry3/guides,josephchappell/guides,vikram7/guides,constantm/guides,knownasilya/guides,jjhampton/guides,kevinkucharczyk/guides,davidpett/guides,ankushagarwal/guides,eoinkelly/guides,timrosenblatt/guides,eoinkelly/guides,jackfranklin/guides,nicobot/guides,anthias/guides,mendeza428/guides,kublaj/guides,tildeio/guides,Joelkang/guides,josephchappell/guides,benjaminokeefe/guides,JKGisMe/guides,kevinkucharczyk/guides,ankushagarwal/guides,eoinkelly/guides,gerry3/guides,SaladFork/emberjs-guides,gregzx/guides,BigGillyStyle/guides,coffeejunk/guides,webPapaya/guides,tleskin/guides,toranb/guides,HeroicEric/guides,knownasilya/guides,andrewstarks/guides,mcfiredrill/guides,alexspeller/guides,knownasilya/guides,papilip/emberjs-guides-french,anthias/guides,rengokantai/guides,BigGillyStyle/guides,kellywerks/guides,ubuntuvim/guides,rengokantai/guides,alexspeller/guides,knownasilya/guides,xymbol/guides,thriqon/guides,mikzar/guides,omni5cience/guides,Joelkang/guides,MSch/guides,timrosenblatt/guides,mcfiredrill/guides,zacharywelch/guides,danielgynn/guides,xymbol/guides,RalfWeinand/guides,JKGisMe/guides,ofridagan/guides,TRMW/guides,MSch/guides,davidpett/guides,papilip/emberjs-guides-french,BigGillyStyle/guides,odarbelaeze/guides,boztek/guides,kagemusha/guides,kagemusha/guides,davidpett/guides,mendeza428/guides,tleskin/guides,aceofspades/guides,coffeejunk/guides,skaterdav85/guides,gerry3/guides,omni5cience/guides,andrewstarks/guides,misfo/guides