Merge branch 'bug/fixYarnTravisIssue' of github.com:storj/service-sto…

…rage-models

* 'bug/fixYarnTravisIssue' of github.com:storj/service-storage-models:
  more testing
  test moar
  moar testing
  More tesitng
  Testing manually installing yarn
  More travis file updates
  Updates to travis to find yarn issue

.travis.yml

@@ -1,8 +1,12 @@
 language: node_js
 node_js:
   - "6.9.1"
+
+sudo: required
+
 services:
   - mongodb
+
 addons:
   apt:
     sources:
@@ -11,6 +15,15 @@ addons:
     packages:
       - mongodb-org-server
       - mongodb-org-shell
+
+cache:
+  yarn: true
+  directories:
+    - node_modules
+
+install:
+  - npm install
+
 after_script:
   - npm run coverage
   - cat ./coverage/lcov.info | ./node_modules/.bin/coveralls