python mutator examples added

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+#!/usr/bin/env python
+# encoding: utf-8
+'''
+Example Python Module for AFLFuzz
+
+@author:     Christian Holler (:decoder)
+
+@license:
+
+This Source Code Form is subject to the terms of the Mozilla Public
+License, v. 2.0. If a copy of the MPL was not distributed with this
+file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+@contact:    choller@mozilla.com
+'''
+
+import random
+
+def init(seed):
+    '''
+    Called once when AFLFuzz starts up. Used to seed our RNG.
+    
+    @type seed: int
+    @param seed: A 32-bit random value
+    '''
+    random.seed(seed)
+    return 0
+
+def fuzz(buf, add_buf):
+    '''
+    Called per fuzzing iteration.
+    
+    @type buf: bytearray
+    @param buf: The buffer that should be mutated.
+    
+    @type add_buf: bytearray
+    @param add_buf: A second buffer that can be used as mutation source.
+    
+    @rtype: bytearray
+    @return: A new bytearray containing the mutated data
+    '''
+    ret = bytearray(buf)
+    # Do something interesting with ret
+
+    return ret
+
+# Uncomment and implement the following methods if you want to use a custom
+# trimming algorithm. See also the documentation for a better API description.
+
+# def init_trim(buf):
+#     '''
+#     Called per trimming iteration.
+#     
+#     @type buf: bytearray
+#     @param buf: The buffer that should be trimmed.
+#     
+#     @rtype: int
+#     @return: The maximum number of trimming steps.
+#     '''
+#     global ...
+#     
+#     # Initialize global variables
+#     
+#     # Figure out how many trimming steps are possible.
+#     # If this is not possible for your trimming, you can
+#     # return 1 instead and always return 0 in post_trim
+#     # until you are done (then you return 1).
+#         
+#     return steps
+# 
+# def trim():
+#     '''
+#     Called per trimming iteration.
+# 
+#     @rtype: bytearray
+#     @return: A new bytearray containing the trimmed data.
+#     '''
+#     global ...
+#     
+#     # Implement the actual trimming here
+#     
+#     return bytearray(...)
+# 
+# def post_trim(success):
+#     '''
+#     Called after each trimming operation.
+#     
+#     @type success: bool
+#     @param success: Indicates if the last trim operation was successful.
+#     
+#     @rtype: int
+#     @return: The next trim index (0 to max number of steps) where max
+#              number of steps indicates the trimming is done.
+#     '''
+#     global ...
+# 
+#     if not success:
+#         # Restore last known successful input, determine next index
+#     else:
+#         # Just determine the next index, based on what was successfully
+#         # removed in the last step
+#     
+#     return next_index