Merge pull request #1087 from ethereum/yann300-patch-6

Circleci - cache node_modules

.circleci/config.yml

@@ -24,7 +24,14 @@ jobs:
 
     steps:
       - checkout
+      - restore_cache:
+          keys:
+            - dep-bundle-{{ checksum "package.json" }}
       - run: npm install
+      - save_cache:
+          key: dep-bundle-{{ checksum "package.json" }}
+          paths:
+            - /repo/node_modules
       - run: npm run lint && npm run test && npm run downloadsolc && npm run make-mock-compiler && npm run setupremix && npm run build
       - run: ./ci/browser_tests.sh
       # - run: if [ $CIRCLE_BRANCH = 'master' ]; then ./ci/deploy_from_travis_master.sh; fi