pip freeze on tornado

for debugging test env

Author: minrk

.travis.yml

@@ -27,7 +27,8 @@ before_install:
       fi
 
 install:
-    - pip install --pre .[test] $EXTRA_PIP
+    - pip install --pre .[test]
+    - pip freeze
     - wget https://github.com/jgm/pandoc/releases/download/1.19.1/pandoc-1.19.1-1-amd64.deb && sudo dpkg -i pandoc-1.19.1-1-amd64.deb