Strings That End in class Are Not Properly Singularized

This is minor, but inflections.rb probably should have a case for strings that look like /^(.)class$/ and perhaps even more generic as /^(.)ss$/

Currently, calling "event_class".singularize returns "event_clas" Adding inflect.singular /^(.*)class$/, '\1class' fixes it.

I noticed that inflections.rb you already have a special case to handle trailing 'ss' : inflect.plural(/(x|ch|ss|sh)$/i, '\1es') inflect.singular(/(x|ch|ss|sh)es$/i, '\1')

but since most strings that already are singular are properly handled when calling singularize ("foo".singularize returns "foo") it probably makes sense to handle the case of "class".singularize == "class"

Thanks