Fix issues with node 8 compatability

Author: AJ Keller

.travis.yml

@@ -4,8 +4,16 @@ node_js:
   - "6.11.1"
   - "7.10.1"
   - "8.1.4"
+env:
+  - CXX=g++-4.8
+addons:
+  apt:
+    sources:
+      - ubuntu-toolchain-r-test
+    packages:
+      - g++-4.8
 install:
   - npm install --all
 script:
   - npm run test-lint
-  - npm run test-cov
+  - npm run test-cov