ci(): add circle.yml

[skip ci]

Author: Awk34

circle.yml

@@ -0,0 +1,26 @@
+## Customize the test machine
+machine:
+  node:
+    version: 5.11.1
+
+## Customize checkout
+checkout:
+  post:
+    - git submodule sync
+    - git submodule update --init # use submodules
+
+## Customize dependencies
+dependencies:
+  pre:
+    - sudo service mongodb stop && curl -L -O https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-ubuntu1204-3.0.2.tgz && tar xvzf mongodb-linux-x86_64-ubuntu1204-3.0.2.tgz && sudo mv mongodb-linux-x86_64-ubuntu1204-3.0.2/bin/* /usr/bin/ && sudo service mongodb start
+
+  # we automatically cache and restore many dependencies between
+  # builds. If you need to, you can add custom paths to cache:
+  cache_directories:
+    - "test/fixtures/node_modules"
+
+## Custom notifications
+#notify:
+  #webhooks:
+    # A list of hashes representing hooks. Only the url field is supported.
+    #- url: https://someurl.com/hooks/circle