RBWM. validate html as 4.01

(There are still 24 warnings from http://validator.w3.org/
about "NET-enabling start-tag requires SHORTTAG YES"
but they are within the main app, so out of scope of these fixes,
which are all within templates/rbwm)
rbwm. microsites functions for override options

as rbwm will be sharing an instance with UK site, allow the
microsite to override OPTION_NO_SUCCESS_STORIES and
OPTION_COMMENTS_ON_NEW_ROW
rbwm microsites config

as per #96