Setting node version on travis and appveyor (#281)

.travis.yml

@@ -15,6 +15,7 @@ env:
     - DOTNET_SKIP_FIRST_TIME_EXPERIENCE: true
     - DOTNET_CLI_TELEMETRY_OPTOUT: 1
     - SIGNALR_TESTS_VERBOSE: 1
+    - TRAVIS_NODE_VERSION: 6.9.1
 mono: none
 python:
   - "2.7"
@@ -30,6 +31,7 @@ branches:
     - /^(.*\/)?ci-.*$/
 before_install:
   - if test "$TRAVIS_OS_NAME" == "osx"; then brew update; brew install openssl python; ln -s /usr/local/opt/openssl/lib/libcrypto.1.0.0.dylib /usr/local/lib/; ln -s /usr/local/opt/openssl/lib/libssl.1.0.0.dylib /usr/local/lib/; fi
+  - if test "$TRAVIS_OS_NAME" == "linux"; then nvm install $TRAVIS_NODE_VERSION; fi
 install:
   - pip install autobahntestsuite "six>=1.9.0"
 script:

appveyor.yml

@@ -12,6 +12,7 @@ build_script:
 install:
   - set PATH=C:\Python27\scripts;%PATH%
   - pip install autobahntestsuite
+  - ps: Install-Product node 6
 clone_depth: 1
 test: off
 deploy: off