I'm now populating the default theme with text classes, just commit
with one for now. There can be tweakings at Elm config app's UI fonts
page, I know, but that will come later (editable preview field, font
hinting/fallback, blablabla).
WARNING: for users testing elm config, an old "rm -rf
~/.elementary/config" might be needed here, after this commit.
SVN revision: 54681