pin appveyors scipy to 0.16 to avoid yet another continuum package issue

Author: wholmgren

appveyor.yml

@@ -31,11 +31,13 @@ install:
     - "python --version"
     - "python -c \"import struct; print(struct.calcsize('P') * 8)\""
 
-    # install xray and depenencies
-    - "conda install --yes --quiet pip numpy scipy pandas nose pytz ephem numba"
+    # install depenencies
+    - "conda install --yes --quiet pip numpy scipy=0.16 pandas nose pytz ephem numba"
+
+    # install pvlib
     - "python setup.py install"
 
 build: false
 
 test_script:
-    - "nosetests -v pvlib"
+    - "nosetests -v pvlib"