Add Node v6 support

Author: John Haley

.travis.yml

@@ -16,6 +16,7 @@ env:
     - export NODE_VERSION="0.12" TARGET_ARCH="x64"
     - export NODE_VERSION="4.1" TARGET_ARCH="x64"
     - export NODE_VERSION="5.8" TARGET_ARCH="x64"
+    - export NODE_VERSION="6" TARGET_ARCH="x64"
 
 matrix:
   fast_finish: true
@@ -29,6 +30,9 @@ matrix:
     - os: linux
       env: export NODE_VERSION="5.8" TARGET_ARCH="ia32"
       sudo: required
+    - os: linux
+      env: export NODE_VERSION="6" TARGET_ARCH="ia32"
+      sudo: required
 
 git:
   depth: 1

appveyor.yml

@@ -29,9 +29,9 @@ environment:
   matrix:
     # Node.js
     - nodejs_version: "0.12"
-    # Node.js
     - nodejs_version: "4.1"
     - nodejs_version: "5.8"
+    - nodejs_version: "6"
 
 matrix:
   fast_finish: true