Address errors, improvements, formatting

- Removed unused code not portable due to buffer() use
- raw_input() does not exist in Python 3
- Fixed octal constant syntax for Python 3
- Fixed TypeError
- Replace if not exists: makedirs(path) with single call: using makedirs(path, exist_ok=True)
- Class inherits from object, can be safely removed from bases in python3: pylint's useless-object-inheritance (W0235) check

Signed-off-by: JoeLametta <JoeLametta@users.noreply.github.com>

whipper/image/image.py

@@ -34,7 +34,7 @@ import logging
 logger = logging.getLogger(__name__)
 
 
-class Image(object):
+class Image:
     """
     :ivar table:    The Table of Contents for this image.
     :vartype table: table.Table