Reintroduce SQLAlchemy warning silencer
Reintroduce SQLAlchemy warning silencer

SQLAlchemy warns about a non unicode param, the warning is
unnecessary so we can just silence it.

USStateDept/FPA_Core,pudo/spendb,johnjohndoe/spendb,openspending/spendb,johnjohndoe/spendb,spendb/spendb,CivicVision/datahub,openspending/spendb,openspending/spendb,nathanhilbert/FPA_Core,johnjohndoe/spendb,nathanhilbert/FPA_Core,CivicVision/datahub,USStateDept/FPA_Core,pudo/spendb,nathanhilbert/FPA_Core,spendb/spendb,spendb/spendb,USStateDept/FPA_Core,CivicVision/datahub,pudo/spendb