Make example applications pep8 compliant. (#553)

* Test examples for pep8 compliance.

* Make rl_pong example pep8 compliant.

* Make policy gradient example pep8 compliant.

* Make lbfgs example pep8 compliant.

* Make hyperopt example pep8 compliant.

* Make a3c example pep8 compliant.

* Make evolution strategies example pep8 compliant.

* Make resnet example pep8 compliant.

* Fix.

examples/policy_gradient/tests/test.py

@@ -10,6 +10,7 @@ from numpy.testing import assert_allclose
 from reinforce.distributions import Categorical
 from reinforce.utils import flatten, concatenate
 
+
 class DistibutionsTest(unittest.TestCase):
 
   def testCategorical(self):
@@ -28,6 +29,7 @@ class DistibutionsTest(unittest.TestCase):
     probs = np.exp(z) / np.sum(np.exp(z))
     self.assertTrue(np.sum(np.abs(probs - counts / num_samples)) <= 0.01)
 
+
 class UtilsTest(unittest.TestCase):
 
   def testFlatten(self):
@@ -54,5 +56,6 @@ class UtilsTest(unittest.TestCase):
     assert_allclose(D["s"], np.array([0, 1, 4, 5]))
     assert_allclose(D["a"], np.array([2, 3, 6, 7]))
 
+
 if __name__ == "__main__":
   unittest.main(verbosity=2)