Include an SVG (hosted on GitHub) in MarkDown

I know that an image can be placed in an MD with the MD syntax of either ![Alt text](/path/to/img.jpg) or ![Alt text](/path/to/img.jpg "Optional title"), but I am having difficulty placing an SVG in MD where the code is hosted on GitHub.

Ultimately using rails3, and changing the model frequently right now, so I am using RailRoady to generate an SVG of the schema diagram of the models. I would like for that SVG to then be placed in the ReadMe.md, and be displayed. When I open the SVG file locally, it does work, so how do I get the browser to render the SVG in the MD file? Given that the code will be dynamic until it is finalized (seemingly never), hosting the SVG in a separate place seems overkill and that I am missing an approach to accomplish this.

The SVG I am trying to include is here on GitHub: https://github.com/specialorange/FDXCM/blob/master/Rails/fdxcm/doc/models_brief.svg

I have tried the following, with an actual image as well to verify the syntax is working, just that the SVG code isn’t being rendered:

![Overview][1]
[1]: https://github.com/specialorange/FDXCM/blob/master/doc/controllers_brief.svg  "Overview"

<img src="https://raw.github.com/specialorange/FDXCM/master/doc/controllers_brief.svg">

![Alt text](https://raw.github.com/specialorange/FDXCM/master/doc/controllers_brief.svg)

[Google Doc](https://docs.google.com/drawings/d/1B95ajItJTAImL2WXISX0fkBLYk3nldea4Vm9eo-VyE4/edit) :

<img src="https://docs.google.com/drawings/pub?id=117XsJ1kDyaY-n8AdPS3_8jTgMyITqaoT3-ah_BSc9YQ&w=960&h=720">

<img src="https://raw.github.com/specialorange/FDXCM/master/doc/controllers_brief.svg">

<img src="https://docs.google.com/drawings/d/1B95ajItJTAImL2WXISX0fkBLYk3nldea4Vm9eo-VyE4/edit">

to get the results of:

1: https://github.com/specialorange/FDXCM/blob/master/Rails/fdxcm/doc/controllers_brief.svg “Overview”

Google Doc :