BLD: Order scipy install before statsmodels.

statsmodels requires scipy to build, so list the scipy install
before statsmodels so that ordered_pip.sh will install it beforehand.

etc/requirements.txt

@@ -6,6 +6,8 @@ Logbook==0.7.0
 pytz==2014.3
 numpy==1.8.1
 
+# scipy is required for statsmodels
+scipy==0.13.2
 # Needed for parts of pandas.stats
 patsy==0.2.1
 statsmodels==0.5.0

etc/requirements_dev.txt

@@ -19,7 +19,6 @@ pyandoc==0.0.1
 
 # Example scripts that are run during unit tests use the following:
 
-scipy==0.13.2
 matplotlib==1.3.1
 # tornado and pyparsing are required by matplotlib
 tornado==3.2