fix(theming): make theme inheritance not depend on DOM order

references #2483

Author: rschmukler

src/core/services/theming/theming.js

@@ -338,6 +338,9 @@ function ThemingProvider($mdColorPalette) {
         if (oldTheme) el.removeClass('md-' + oldTheme +'-theme');
         el.addClass('md-' + theme + '-theme');
         el.data('$mdThemeName', theme);
+        if (ctrl) {
+          el.data('$mdThemeController', ctrl);
+        }
       }
     };