readded msgpack-numpy due to test dependencies

.gitignore

@@ -119,3 +119,5 @@ test_save.dat
 .visualizations
 
 playground/
+**/tmp
+**/TEMP
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flatland/envs/persistence.py

@@ -2,6 +2,7 @@
 
 import pickle
 import msgpack
+import msgpack_numpy
 import numpy as np
 
 from flatland.envs import rail_env 
@@ -22,6 +23,7 @@ from flatland.envs import malfunction_generators as mal_gen
 from flatland.envs import rail_generators as rail_gen
 from flatland.envs import line_generators as line_gen
 
+msgpack_numpy.patch()
 
 class RailEnvPersister(object):
 
@@ -308,4 +310,4 @@ class RailEnvPersister(object):
         self.height, self.width = self.rail.grid.shape
         self.rail.height = self.height
         self.rail.width = self.width
-        self.dones = dict.fromkeys(list(range(self.get_num_agents())) + ["__all__"], False)
+        self.dones = dict.fromkeys(list(range(self.get_num_agents())) + ["__all__"], False)
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