Merge pull request reactjs#131 from jxom/add-circle-ci-config

Add CircleCI config

Author: bvaughn

.circleci/config.yml

@@ -0,0 +1,22 @@
+version: 2
+jobs:
+  build:
+    docker:
+      - image: circleci/node:latest
+    steps:
+      - checkout
+      - restore_cache:
+          keys:
+          - dependencies-{{ checksum "package.json" }}
+          # fallback to using the latest cache if no exact match is found
+          - dependencies-
+      - run:
+          name: Install
+          command: yarn install
+      - save_cache:
+          paths:
+            - node_modules
+          key: dependencies-{{ checksum "package.json" }}
+      - run:
+          name: Check Prettier, ESLint, Flow
+          command: yarn ci-check