CI: install mpl-dev

Author: TomAugspurger

ci/install_travis.sh

@@ -124,7 +124,7 @@ else
     echo "pip installs"
     REQ="ci/requirements-${TRAVIS_PYTHON_VERSION}${JOB_TAG}.pip"
     if [ -e ${REQ} ]; then
-        pip install --pre --upgrade -r $REQ
+        pip install --upgrade -r $REQ
     fi
 
     # remove any installed pandas package
@@ -138,5 +138,9 @@ else
 
 fi
 
+if [ "$JOB_NAME" == "34_slow" ]; then
+    conda install -c conda-forge/label/rc -c conda-forge matplotlib
+fi
+
 echo "done"
 exit 0

ci/requirements-2.7_SLOW.pip

@@ -1 +0,0 @@
-matplotlib==2.0.0b3

ci/requirements-2.7_SLOW.run

@@ -1,6 +1,7 @@
 python-dateutil
 pytz
 numpy=1.8.2
+matplotlib=1.3.1
 scipy
 patsy
 statsmodels