Make it possible to plug custom reducers from the Parallel API
Make it possible to plug custom reducers from the Parallel API

lesteve/joblib,joblib/joblib,aabadie/joblib,joblib/joblib,tomMoral/joblib,lesteve/joblib,karandesai-96/joblib,aabadie/joblib,karandesai-96/joblib,tomMoral/joblib