Added vagrant development environment

CONTRIBUTING.rst

@@ -88,6 +88,13 @@ Ready to contribute? Here's how to set up `nagios_check_paloalto` for local deve
 
 7. Submit a pull request through the GitHub website.
 
+Virtual development environment
+-------------------------------
+
+You can use Vagrant to start a virtual development environment, where all the necessary dependencies are already installed.
+
+Please have a look at the Vagrantfile.
+
 Pull Request Guidelines
 -----------------------
 

Vagrantfile

@@ -0,0 +1,16 @@
+Vagrant.configure(2) do |config|
+  config.vm.box = "ubuntu/xenial64"
+
+  config.vm.provider "virtualbox" do |vb|
+    vb.memory = "1024"
+  end
+
+  config.vm.provision "shell", inline: <<-SHELL
+    sudo apt-get install python-software-properties -y
+    sudo add-apt-repository ppa:fkrull/deadsnakes -y
+    sudo apt-get update
+    sudo apt-get install -y build-essential libxslt1-dev libxml2-dev python-dev python3-dev libz-dev python3.3 python3.4 python3.3-dev python3.4-dev python-sphinx
+    wget https://bootstrap.pypa.io/get-pip.py
+    python get-pip.py
+  SHELL
+end