Use "commander" for cli argv handling

.travis.yml

@@ -1,6 +1,7 @@
 ---
 language: node_js
 node_js:
+  - 0.10
   - 4
   - 6
 cache:

tasks/e2e.sh

@@ -14,6 +14,11 @@
 # Start in tasks/ even if run from root directory
 cd "$(dirname "$0")"
 
+# CLI and app temporary locations
+# http://unix.stackexchange.com/a/84980
+temp_cli_path=`mktemp -d 2>/dev/null || mktemp -d -t 'temp_cli_path'`
+temp_app_path=`mktemp -d 2>/dev/null || mktemp -d -t 'temp_app_path'`
+
 function cleanup {
   echo 'Cleaning up.'
   cd $root_path
@@ -53,15 +58,22 @@ set -x
 cd ..
 root_path=$PWD
 
+npm install
+
+# If the node version is < 4, the script should just give an error.
+if [ `node --version | sed -e 's/^v//' -e 's/\..\+//g'` -lt 4 ]
+then
+  cd $temp_app_path
+  node "$root_path"/packages/create-react-app/index.js test-node-version && exit 1 || exit 0
+fi
+
 if [ "$USE_YARN" = "yes" ]
 then
   # Install Yarn so that the test can use it to install packages.
   npm install -g yarn@0.17.10 # TODO: remove version when https://github.com/yarnpkg/yarn/issues/2142 is fixed.
   yarn cache clean
 fi
 
-npm install
-
 # Lint own code
 ./node_modules/.bin/eslint --ignore-path .gitignore ./
 
@@ -117,13 +129,10 @@ mv package.json.orig package.json
 # ******************************************************************************
 
 # Install the CLI in a temporary location
-# http://unix.stackexchange.com/a/84980
-temp_cli_path=`mktemp -d 2>/dev/null || mktemp -d -t 'temp_cli_path'`
 cd $temp_cli_path
 npm install $cli_path
 
 # Install the app in a temporary location
-temp_app_path=`mktemp -d 2>/dev/null || mktemp -d -t 'temp_app_path'`
 cd $temp_app_path
 create_react_app --scripts-version=$scripts_path test-app
 
@@ -185,7 +194,6 @@ npm test -- --watch=no
 # Test the server
 npm start -- --smoke-test
 
-
 # ******************************************************************************
 # Test --scripts-version with a version number
 # ******************************************************************************