actually use NODE_VERSION

scripts/node/install.sh

@@ -13,8 +13,9 @@ if [ ${TRAVIS_OS_NAME} == "linux" ]; then
     mason install mesa 10.4.3
 fi
 
-# nvm already exists on the Travis image
 . ~/.nvm/nvm.sh
+
+mapbox_time "install_$NODE_VERSION" \
 nvm install $NODE_VERSION
 
 node --version

scripts/node/run.sh

@@ -11,6 +11,9 @@ BUILDTYPE=${BUILDTYPE:-Release}
 # Build
 ################################################################################
 
+. ~/.nvm/nvm.sh
+nvm use $NODE_VERSION
+
 mapbox_time "checkout_styles" \
 git submodule update --init styles