Recommend Node v4 & use as default (#7102)

refs #7098

- Use Node.js v4 as our default build environment
- Add Node.js v6 as an allowed failure
- Update contributor guidelines and readme
- Fix issue with branch exceptions

.github/CONTRIBUTING.md

@@ -98,7 +98,7 @@ Any other info e.g. Why do you consider this to be a bug? What did you expect to
 ### Technical details:
 
 * Ghost Version: master (latest commit: a761de2079dca4df49567b1bddac492f25033985)
-* Node Version: 0.10.16
+* Node Version: 4.4.7
 * Browser: Chrome 48.0.2564.109 on Mac OS X 10.10.4
 * Database: SQLite / MySQL / postgres
 ```
@@ -188,7 +188,7 @@ Looking to get setup to work on Ghost? AWESOME! The [Ghost-Vagrant](https://gith
 
 **What you'll need:**
 
-- Node version 0.10.x & npm
+- A supported Node.js version & npm  (see [Supported Node Versions](http://support.ghost.org/supported-node-versions/))
 - phantomjs 2.1.x
 ([instructions](https://github.com/TryGhost/Ghost/wiki/Functional-testing-with-PhantomJS-and-CasperJS)) for running tests
 

.travis.yml

@@ -1,9 +1,10 @@
 language: node_js
 # When changing node version also update it on lines 34, 36 and 46.
 node_js:
-  - "0.10"
-  - "0.12"
   - "4"
+  - "0.12"
+  - "0.10"
+  - "6"
 sudo: false
 cache:
   directories:
@@ -23,10 +24,13 @@ env:
     - DB=pg NODE_ENV=testing-pg
 matrix:
   include:
-    - node_js: "0.10"
+    - node_js: "4"
       env: TEST_SUITE=lint
+  allow_failures:
+    - node_js: "6"
+  fast_finish: true
 branches:
-  exclude:
+  except:
     - /^greenkeeper-.+$/
 before_install:
   - if [ $DB == "mysql" ]; then mysql -e 'create database ghost_testing'; fi
@@ -34,7 +38,7 @@ before_install:
 after_success:
   - |
       if [ "$TRAVIS_PULL_REQUEST" = "false" ]; then
-        if [[ "$DB" = "sqlite3" && "$TRAVIS_NODE_VERSION" = "0.10" ]]; then
+        if [[ "$DB" = "sqlite3" && "$TRAVIS_NODE_VERSION" = "4" ]]; then
           echo "Generate coverage..."
           grunt coverage
           npm install -g codeclimate-test-reporter

README.md

@@ -20,7 +20,7 @@ The project is maintained by a non-profit organisation called the **Ghost Founda
 
 # Quick Start Install
 
-Make sure you've installed Node.js - We recommend the latest **Node v0.10.x** release. For other versions [click here](http://support.ghost.org/supported-node-versions/). May contain nuts.
+Make sure you've installed Node.js - We recommend the latest **Node v4 LTS** release. For other versions [click here](http://support.ghost.org/supported-node-versions/). May contain nuts.
 
 1. Download the [latest release](https://ghost.org/developers/) of Ghost
 1. Unzip in the location you want to install
@@ -39,8 +39,8 @@ More [install docs](http://support.ghost.org/installation/) here in case you got
 Install Node.js. (See [Supported Node.js versions](http://support.ghost.org/supported-node-versions/))
 
 ```bash
-# Node v0.10.x - recommended
-# Node v0.12.x and v4.2+ LTS - supported
+# Node v4.2+ LTS - recommended
+# Node v0.10.x and v0.12.x - supported
 #
 # Choose wisely
 ```

core/client

@@ -1 +1 @@
-Subproject commit a82181fdd67388ffa6c780767175b7659810bcbf
+Subproject commit eb31c438d50833a8925e055e8bea0f4c8b1c34bc