Added testing.fails_on('db') failure-asserter.
Added testing.fails_on('db') failure-asserter.

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