Summary of changes between 4.0.0 Alpha and current state of master branch

[Jeffrey Nguyen (jeffrngu)]

Hi,

I can see that we're prepping for 4.0.0 RC, so we probably have this 
information available somewhere.   Could someone point me to where I can get 
$subject?  I'm not looking for a full list of JIRAs fixed between 4.0.0 alpha 
and current master branch (although it's nice to have).  Rather, I'd like to 
know a high-level summary of the changes.

Thanks,
-Jeffrey