TST Refactor unittests. Everyone gets a random seed! (#1341)

Author: ColCarroll

pymc3/tests/helpers.py

@@ -0,0 +1,9 @@
+import unittest
+import numpy.random as nr
+
+
+class SeededTest(unittest.TestCase):
+    random_seed = 20160907
+
+    def setUp(self):
+        nr.seed(self.random_seed)