Add Travis and Codecov integration

Author: ChALkeR

Diff for: .travis.yml

@@ -0,0 +1,15 @@
+language: node_js
+node_js:
+  - "4"
+  - "stable"
+notifications:
+  email: false
+cache:
+  directories:
+    - $HOME/.npm/
+    - node_modules
+before_install:
+  - npm install -g codecov
+after_success:
+  - npm run cover
+  - codecov

Diff for: codecov.yml

@@ -0,0 +1,9 @@
+coverage:
+  status:
+    project:
+      default:
+        threshold: 1
+    changes: off
+    patch: off
+
+comment: off