fix non2.5 compat @property usage
fix non2.5 compat @property usage

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