New types of images. (RPi-Distro#352)

README.md

@@ -277,14 +277,13 @@ maintenance and allows for more easy customization.
    enhancements, etc.  This is a base desktop system, with some development
    tools installed.
 
- - **Stage 4** - Raspbian system meant to fit on a 4GB card.  More development
+ - **Stage 4** - Normal Raspbian image. System meant to fit on a 4GB card.  More development
    tools, an email client, learning tools like Scratch, specialized packages
    like sonic-pi, system documentation, office productivity, etc.  This is the
    stage that installs all of the things that make Raspbian friendly to new
    users.
 
- - **Stage 5** - The official Raspbian Desktop image. Right now only adds
-   Mathematica.
+ - **Stage 5** - The Raspbian Full image.
 
 ### Stage specification