added __repr__ to HashSet
added __repr__ to HashSet

Cito/sqlalchemy,graingert/sqlalchemy,WinterNis/sqlalchemy,Akrog/sqlalchemy,ThiefMaster/sqlalchemy,276361270/sqlalchemy,epa/sqlalchemy,hsum/sqlalchemy,itkovian/sqlalchemy,halfcrazy/sqlalchemy,davidfraser/sqlalchemy,brianv0/sqlalchemy,Akrog/sqlalchemy,Cito/sqlalchemy,elelianghh/sqlalchemy,wujuguang/sqlalchemy,EvaSDK/sqlalchemy,robin900/sqlalchemy,wujuguang/sqlalchemy,bootandy/sqlalchemy,robin900/sqlalchemy,zzzeek/sqlalchemy,epa/sqlalchemy,j5int/sqlalchemy,Cito/sqlalchemy,dstufft/sqlalchemy,davidjb/sqlalchemy,wfxiang08/sqlalchemy,WinterNis/sqlalchemy,bdupharm/sqlalchemy,graingert/sqlalchemy,bdupharm/sqlalchemy,sqlalchemy/sqlalchemy,pdufour/sqlalchemy,halfcrazy/sqlalchemy,itkovian/sqlalchemy,elelianghh/sqlalchemy,dstufft/sqlalchemy,monetate/sqlalchemy,hsum/sqlalchemy,276361270/sqlalchemy,brianv0/sqlalchemy,ThiefMaster/sqlalchemy,monetate/sqlalchemy,alex/sqlalchemy,inspirehep/sqlalchemy,EvaSDK/sqlalchemy,davidfraser/sqlalchemy,davidjb/sqlalchemy,olemis/sqlalchemy,olemis/sqlalchemy,alex/sqlalchemy,sandan/sqlalchemy,bootandy/sqlalchemy,sandan/sqlalchemy,j5int/sqlalchemy,inspirehep/sqlalchemy,alex/sqlalchemy,wfxiang08/sqlalchemy,pdufour/sqlalchemy