- restore constructor docs blown away in the merge
- restore constructor docs blown away in the merge

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