Update development environment setup guide (#1804)

source/developers/development_environment.markdown

@@ -11,14 +11,52 @@ footer: true
 
 You'll need to set up a development environment if you want to develop a new feature or component for Home Assistant. Read on to learn how to set up.
 
-* Visit the [Home Assistant repository](https://github.com/home-assistant/home-assistant) and click **Fork**.
+### {% linkable_title Setup Local Repository %}
-
-* Consider setting up a virtual environment using [`venv`](https://docs.python.org/3.4/library/venv.html) before running the setup script.
 
+Visit the [Home Assistant repository](https://github.com/home-assistant/home-assistant) and click **Fork**.
+Once forked, setup your local copy of the source using the commands:
 ```bash
 $ git clone https://github.com/YOUR_GIT_USERNAME/home-assistant.git
 $ cd home-assistant
 $ git remote add upstream https://github.com/home-assistant/home-assistant.git
+```
+
+### {% linkable_title Prepare Your Environment %}
+
+#### {% linkable_title Core dependencies %} 
+
+Install the core dependencies.
+```bash
+$ sudo apt-get install python3-pip python3-dev libssl-dev
+```
+<p class='note'>
+Different distributions have different package installation mechanisms and sometimes packages names as well. For example Centos would use: `sudo yum install epel-release && sudo yum install python34 python34-devel mysql-devel`
+</p>
+
+Additional dependencies exist if you you plan to perform Frontend Development, please read the [Frontend](https://home-assistant.io/developers/frontend/) section to learn more.
+
+#### {% linkable_title Setting up virtual environment (optional) %} 
+
+If you plan on providing isolation to your environment using [`venv`](https://docs.python.org/3.4/library/venv.html). Within the `home-assistant` directory, create and activate your virtual environment.
+
+If using Python < 3.6 `pyvenv` is the recommended method of setting up virtual environments, you'll need to install the `python3-venv` package.
+```bash
+$ sudo apt-get install python3-venv
+$ pyvenv venv
+$ source venv/bin/activate
+```
+
+If using Python 3.6 `pyvenv` has been deprecated:
+```bash
+$ python3 -m venv venv
+$ source venv/bin/activate
+```
+
+### {% linkable_title Setup and Run %}
+
+* On Mac OS X and Linux (remember to activate your virtual environment before running setup, if you are using one):
+```bash
+$ cd home-assistant
 $ script/setup
 ```