Add missing __eq__ and __repr__ methods (#1178)

* Add missing equality + repr methods

* Update gym.spaces tests

gym/spaces/multi_binary.py

@@ -5,12 +5,21 @@ class MultiBinary(gym.Space):
     def __init__(self, n):
         self.n = n
         gym.Space.__init__(self, (self.n,), np.int8)
+
     def sample(self):
         return gym.spaces.np_random.randint(low=0, high=2, size=self.n).astype(self.dtype)
+
     def contains(self, x):
         return ((x==0) | (x==1)).all()
 
     def to_jsonable(self, sample_n):
         return np.array(sample_n).tolist()
+
     def from_jsonable(self, sample_n):
         return [np.asarray(sample) for sample in sample_n]
+
+    def __repr__(self):
+        return "MultiBinary({})".format(self.n)
+
+    def __eq__(self, other):
+        return self.n == other.n