Added Audax Health logo.

[Audax Health](http://www.audaxhealth.com/) is a health tech company of about 120 employees. We are a Scala shop and use Lift for our flagship product: https://www.zensey.com/ 

From David Pollack:

> Jeff,
> 
> Please feel encouraged to add Audax Health to https://github.com/lift/cms_site/blob/master/site/templates-hidden/logocontainer.cms.xml That'll put you folks up on the liftweb.net site.
> 
> Thanks,
> David

Thanks for the invite! Here is a hi-res photo of our logo.