ci: bump node version to 6.9.5 and npm to 3.10.7

this is required by @angular/cli

.nvmrc

@@ -1 +1 @@
-6.6.0
+6.9.5

.travis.yml

@@ -1,7 +1,8 @@
 language: node_js
 sudo: false
 node_js:
-  - '6.6.0'
+  - '6.9.5'
+
 git:
   # Increased from default (50) to ensure last release tag is in this range
   depth: 150

circle.yml

@@ -1,10 +1,10 @@
 machine:
   node:
-    version: 6.6.0
+    version: 6.9.5
 
 dependencies:
   pre:
-    - npm install -g npm@3.5.3
+    - npm install -g npm@3.10.7
 
 test:
   override:

gulpfile.js

@@ -11,8 +11,8 @@
 // THIS CHECK SHOULD BE THE FIRST THING IN THIS FILE
 // This is to ensure that we catch env issues before we error while requiring other dependencies.
 require('./tools/check-environment')({
-  requiredNpmVersion: '>=3.5.3 <4.0.0',
-  requiredNodeVersion: '>=5.4.1 <7.0.0',
+  requiredNpmVersion: '>=3.10.7 <4.0.0',
+  requiredNodeVersion: '>=6.9.5 <7.0.0',
 });
 
 const gulp = require('gulp');

scripts/ci-lite/env.sh

@@ -4,8 +4,8 @@ set -e -o pipefail
 
 echo 'travis_fold:start:ENV'
 
-NODE_VERSION=5.4.1
-NPM_VERSION=3.5.3
+NODE_VERSION=6.9.5
+NPM_VERSION=3.10.7 # do not upgrade to >3.10.8 unless https://github.com/npm/npm/issues/14042 is resolved
 YARN_VERSION=0.19.1
 CHROMIUM_VERSION=403382 # Chrome 53 linux stable, see https://www.chromium.org/developers/calendar
 SAUCE_CONNECT_VERSION=4.3.11