Add in Python version check (must be 2.7.x)
Empty directories are also synced now
Non-critical error 'MD5 not found' are printed with no 'Error' text
Correct the silly __verify_current_file() check in __walk_upload()
From collielee: Add in the missing 'self.__current_file_size = getfilesize(lfile)' line in __walk_upload()