updated nodejs setup

README.md

@@ -25,7 +25,14 @@ The following steps were reproduced in that order on a fully updated Ubuntu 15.1
 
 1. Install **required libraries and tools**
     ```bash
-    sudo apt-get install openjdk-8-jdk mongodb git nodejs npm maven tomcat8
+    sudo apt-get install openjdk-8-jdk mongodb git maven tomcat8
+    ```
+    
+    install a recent version of node (the official repositories contain old versions)
+    ```bash
+    curl -sL https://deb.nodesource.com/setup_5.x | sudo -E bash -
+    sudo apt-get install nodejs
+    sudo ln -s /usr/bin/nodejs /usr/bin/nodebower inst
     ```
     
     if watchman will be used (see below) additional packages are required for building watchman from source