1.4.23
move down py/impl/XYZ to py/_XYZ
remove trailing whitespace everywhere
introduce path.ensure_dir() as a synonym for ensure(..., dir=1)
win32: py.path.local.sysfind(name) will preferrably return files with extensions so that if "X" and "X.bat" or "X.exe" is on the PATH, one of the latter two will be returned.
try to fix failures related to subversion 1.7.