Basic tags not being defined results in incorrect tinymce

Hi

I stumbled upon this "bug":
-> using tinymce as default editor for comments, bold and italic text won't get styled when using this base theme. Also the output doesn't get any markup.

Easy fix:
define them in style.css:

strong, b { font-weight: bold; }
em, i { font-style: italic; }

Maybe the maintainer should incorporate this?