minor fixes from internal (#665)

* sync internal changes. Make ddpg work with vecenvs

* B -> nenvs for consistency with other algos, small cleanups

* eval_done[d]==True -> eval_done[d]

* flake8 and numpy.random.random_integers deprecation warning

* Merge branch 'master' of github.com:openai/games into peterz_track_baselines_branch

setup.py

@@ -48,9 +48,13 @@ setup(name='baselines',
 
 
 # ensure there is some tensorflow build with version above 1.4
-try:
-    from distutils.version import StrictVersion
-    import tensorflow
-    assert StrictVersion(re.sub(r'-rc\d+$', '', tensorflow.__version__)) >= StrictVersion('1.4.0')
-except ImportError:
-    assert False, "TensorFlow needed, of version above 1.4"
+import pkg_resources
+tf_pkg = None
+for tf_pkg_name in ['tensorflow', 'tensorflow-gpu']:
+    try:
+        tf_pkg = pkg_resources.get_distribution(tf_pkg_name)
+    except pkg_resources.DistributionNotFound:
+        pass
+assert tf_pkg is not None, 'TensorFlow needed, of version above 1.4'
+from distutils.version import StrictVersion
+assert StrictVersion(re.sub(r'-rc\d+$', '', tf_pkg.version)) >= StrictVersion('1.4.0')