documents the class style naming for OL, although it isn't implemented yet,
so that we have a standard to work against. Update release scripts, tests,
and create a 'theme' directory which will hold theme information as it is
developed.
git-svn-id: http://svn.openlayers.org/trunk/openlayers@1639 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
