Use nightly ray release

Author: Kai Fricke

requirements.txt

@@ -14,7 +14,12 @@ bs4
 awscli==1.16.35
 flask
 spacy
-ray[tune]
+
+# Replace this block with ray[tune] after next PyPI release
+https://s3-us-west-2.amazonaws.com/ray-wheels/latest/ray-0.9.0.dev0-cp36-cp36m-manylinux1_x86_64.whl
+tabulate
+tensorboardX
+pandas
 
 # PyTorch Theme
 -e git+git://github.com/pytorch/pytorch_sphinx_theme.git#egg=pytorch_sphinx_theme