BLD: Downgrade to scipy 0.17.

Anaconda doesn't have windows builds for scipy 0.18 (nor does
conda-forge.)

.travis.yml

@@ -9,7 +9,7 @@ env:
     # ANACONDA_TOKEN with api:write
     - secure: "RJJjjQloUjCSkhII93QM+YAsr6YYq7hPFvlbnT07ogn1NeUPsVCyJ97oiZfKtPgdbd24hdQP/CHfB0HgTTES8n996tN3QWc4hZj0e10kFyIlas9qnkrRYRR1jxGShBDXrLdx/tGh8z1qnnCm1fy+fDhAF7Zerouwy4EA2YEzxdE="
   matrix:
-    - NUMPY_VERSION=1.11.1 SCIPY_VERSION=0.18.0
+    - NUMPY_VERSION=1.11.1 SCIPY_VERSION=0.17.1
 cache:
   directories:
     - $HOME/.cache/.pip/

appveyor.yml

@@ -17,14 +17,13 @@ environment:
       PYTHON_ARCH: "64"
       PANDAS_VERSION: "0.18.1"
       NUMPY_VERSION: "1.11"
-      SCIPY_VERSION: "0.18.0"
+      SCIPY_VERSION: "0.17.0"
 
     - PYTHON_VERSION: "3.4"
       PYTHON_ARCH: "64"
       PANDAS_VERSION: "0.18.1"
       NUMPY_VERSION: "1.11"
-      SCIPY_VERSION: "0.18.0"
-
+      SCIPY_VERSION: "0.17.0"
 
 # We always use a 64-bit machine, but can build x86 distributions
 # with the PYTHON_ARCH variable (which is used by CMD_IN_ENV).

etc/requirements.txt

@@ -13,7 +13,7 @@ numpy==1.11.1
 
 # scipy and pandas are required for statsmodels,
 # statsmodels in turn is required for some pandas packages
-scipy==0.18.0
+scipy==0.17.1
 pandas==0.18.1
 pandas-datareader==0.2.1
 # Needed for parts of pandas.stats