Added os_rename function that works in windows and unix --------------------------------------------------------- Without this workaround, renaming a file to an existing filename will fail under windows. This workaround is dirty, because it simply removes the other file, but in this case it shouldn't be too harmful.
Added os_rename function that works in windows and unix
---------------------------------------------------------
Without this workaround, renaming a file to an existing filename will
fail under windows. This workaround is dirty, because it simply removes
the other file, but in this case it shouldn't be too harmful.

geoff-codes/reposado,jessepeterson/reposado,alexandregz/reposado