Change type of Matrix data from list to numpy.ndarray;

Restructure tests to use directly == on a Matrix using ==.all() from numpy.ndarray;
Further implementation of the Matrix class

src/vector.py

@@ -1,3 +1,5 @@
+import numpy
+
 from matrix import Matrix
 
 
@@ -5,6 +7,11 @@ class Vector(Matrix):
     __data__ = []
 
     def __init__(self, data):
+        """
+
+        :type data: list | int
+        """
+        super().__init__(numpy.array([0]))  # TODO: remove in future
         if isinstance(data, list):
             self.__data__ = data
         elif isinstance(data, int):