Snippets filter isn't a valid setting anymore

It looks like it was pulled out into the snippets extension but this
setting was missed.
So @trusty_config actually needs to match config in translations

Hoo boy. This was... not intuitive. Turns out, the config in the
translations needs to match what's used in the t() function, which got
renamed to @trusty_config because there was no way to see what that
corresponded to.
These are TrustyCms.config settings, not rails settings
This seems to be loading initializers twice

Which the config stuff doesn't like very much :( I've tried trusty_blank
without this, and it seems to be working okay...
Errors.on no longer exists

It's now either errors.get or errors[], I went with errors[].

See
http://stackoverflow.com/questions/7526499/undefined-method-on-for-actionmodel
Yay more magic configs that have to match!
Yay more html_safe! Now we can edit site preferences.
Merge pull request #70 from carols10cents/site-preferences

Site preferences