I had installed my themes incorrectly so the editor did not load the editor.css file. I have installed the themes correctly and now the editor loads the editor.css file.
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I added some additional themes. I copied the editor and typography css files from the default themes to the added themes in the css folders. I can't get the editor to load the styling classes from the added themes, I can only load editing styles from the default themes blackcandy and tutorial. Anyone else have this problem? I've flushed the cache several times, didn't help.

Took me a while to understand how this was happening. Basically if you have a editor.css file in the theme SS admin will pick up on this and load it.
If you look at the blackcandy editor.css file you'll see @import "typography.css";
But you can just code the styles directly in there. You'll need to make sure Layout.css also has the same styles to be rendered on the front end.