Add tox caching for 2.7-core

Author: jonmmease

Diff for: .circleci/config.yml

@@ -10,12 +10,20 @@ jobs:
 
     steps:
       - checkout
+      - restore_cache:
+            keys:
+              - tox-v1-{{ checksum "tox.ini" }}
+              - tox-v1-
       - run:
           name: Install tox
           command: 'sudo pip install tox'
       - run:
           name: Test with tox
           command: 'tox -e py27-core'
+      - save_cache:
+          key: tox-v1-{{ checksum "tox.ini" }}
+          paths:
+            - .tox
 
   "python-3.4-core":
     docker:
@@ -209,16 +217,16 @@ workflows:
   build:
     jobs:
       - "python-2.7-core"
-      - "python-3.4-core"
-      - "python-3.5-core"
-      - "python-3.6-core"
-      - "python-3.7-core"
-      - "python-2.7-optional"
-      - "python-3.4-optional"
-      - "python-3.5-optional"
-      - "python-3.6-optional"
-      # 3.7 optional disabled due to current shapely incompatibility
-      # - "python-3.7-optional"
-      - "python-2.7-plot_ly"
-      - "python-3.4-plot_ly"
-      - "python-3.7-plot_ly"
+#      - "python-3.4-core"
+#      - "python-3.5-core"
+#      - "python-3.6-core"
+#      - "python-3.7-core"
+#      - "python-2.7-optional"
+#      - "python-3.4-optional"
+#      - "python-3.5-optional"
+#      - "python-3.6-optional"
+#      # 3.7 optional disabled due to current shapely incompatibility
+#      # - "python-3.7-optional"
+#      - "python-2.7-plot_ly"
+#      - "python-3.4-plot_ly"
+#      - "python-3.7-plot_ly"