Merge pull request #1229 from saper/node5

CI: Build for node 5.x

.travis.yml

@@ -17,6 +17,7 @@ env:
     - export NODE_VERSION="iojs-v2"
     - export NODE_VERSION="iojs-v3"
     - export NODE_VERSION="4"
+    - export NODE_VERSION="5"
 
 matrix:
   fast_finish: true

appveyor.yml

@@ -27,6 +27,7 @@
       - nodejs_version: 2
       - nodejs_version: 3
       - nodejs_version: 4
+      - nodejs_version: 5
 
   install:
     - ps: Install-Product node $env:nodejs_version $env:platform