support extra template paths for plugins. 
support extra template paths for plugins. 
CivicVision/datahub,pudo/spendb,spendb/spendb,nathanhilbert/FPA_Core,USStateDept/FPA_Core,CivicVision/datahub,nathanhilbert/FPA_Core,johnjohndoe/spendb,johnjohndoe/spendb,spendb/spendb,USStateDept/FPA_Core,pudo/spendb,pudo/spendb,nathanhilbert/FPA_Core,USStateDept/FPA_Core,openspending/spendb,johnjohndoe/spendb,spendb/spendb,openspending/spendb,openspending/spendb,CivicVision/datahub