fix adapt() so that DB-specified typedecorator replacements work
fix adapt() so that DB-specified typedecorator replacements work

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