Updated Implementation Framework

Updated to cover changes made by Dan to Master regarding general design changes

Also added remove_two_worst survivor selection method

src/mutation/__init__.py

@@ -1,2 +1,2 @@
 # FROM (. means local) file_name IMPORT function_name
-from .mutation_types import Mutation_Types
+from .mutation_methods import Mutation_Methods

src/mutation/mutation_methods.py

@@ -1,6 +1,6 @@
 import random
 
-class Mutation_Types:
+class Mutation_Methods:
     
     def __init__(self):
         pass