Update the requirements ReadMe

Author: mdmintz

help_docs/requirements_installation.md

@@ -1,13 +1,13 @@
-### Installation Instructions for Python, pip, brew, git, and virtualenv (or virtualenvwrapper)
+## Installation Instructions for Python, pip, brew, git, and virtualenv (or virtualenvwrapper)
 
 
-#### [Python 2.7](https://www.python.org/downloads/)
+### [Python 2.7](https://www.python.org/downloads/)
 
 If you're a MAC user, that should already come preinstalled on your machine. Although Python 3 exists, you'll want Python 2 (both of these major versions are being improved in parallel). Python 2.7.10 is the one I've been using on my Mac.
 
 If you're a WINDOWS user, [download the latest 2.* version from here](https://www.python.org/downloads/release/python-2710/).
 
-#### [Pip](https://en.wikipedia.org/wiki/Pip_%28package_manager%29)
+### [Pip](https://en.wikipedia.org/wiki/Pip_%28package_manager%29)
 
 If "pip" did not come with your Python installation, you can [GET PIP HERE](https://pip.pypa.io/en/latest/installing/).
 
@@ -17,19 +17,27 @@ sudo easy_install pip
 ```
 Then make sure it's on your path.
 
-#### [Homebrew](http://brew.sh/) + [Git](http://git-scm.com/) (OPTIONAL)
+### [Homebrew](http://brew.sh/) (MAC-ONLY) (OPTIONAL)
 
-(NOTE: You can download the SeleniumBase repository right from GitHub and skip all the git-related commands. That's probably the fastest way if you want to quickly get a live demo of this tool up and running.)
+Homebrew allows you to install things more easily, such as Git, Chromedriver, and PhantomJS.
 
 ```bash
 ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
 brew update
+```
+
+### [Git](http://www.git-scm.com)
+
+(NOTE: You can download the SeleniumBase repository right from GitHub and skip all the git-related commands. That's probably the fastest way if you want to quickly get a live demo of this tool up and running.)
+
+MAC-ONLY: (This step only works if you installed Homebrew in the previous step)
+```bash
 brew install git
 ```
 
-(WINDOWS users: Skip the Homebrew part and [download Git here](http://git-scm.com/download).)
+(WINDOWS users: Skip the Homebrew part and [download Git here](http://git-scm.com/downloads).)
 
-#### [Virtualenv](http://virtualenv.readthedocs.org/en/latest/) or [Virtualenvwrapper](http://virtualenvwrapper.readthedocs.org/en/latest/)
+### [Virtualenv](http://virtualenv.readthedocs.org/en/latest/) or [Virtualenvwrapper](http://virtualenvwrapper.readthedocs.org/en/latest/)
 
 Mac: (The old regular way):