Code Mirror integration which adds syntax highlighting, theming, line nu... #5
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...mbers & tab spacing
This addresses the line number TODO item and then some! Codemirror is pretty awesome and lightweight compared to the others http://codemirror.net/ . I can add some more codemirror integration (such as code folding & vim bindings) if you like what I've done so far.
I've included the rubyblue theme, but really you can write your own theme if you want or adjust the current one. I couldn't find a default railscasts theme :)