ENH Upgrade to joblib 0.8.0a2
ENH: reduce memory usage and IPC overhead when fitting forests by using the new threading backend
ENH Release gil in _tree.pyx:predict
ENH Use backend="threading" for forest regression as well
DOC Update whats_new.rst to document threading backed for forests
FIX: broken sed command under OSX in joblib sync script
ENH: parallize the BaseForest.apply method with the threading backend