Add BumbleberryOverrideHelper for modern feature support and update main.js for responsive column visibility although not needed with override. Fixes #10

app/helpers/bumbleberry_override_helper.rb

@@ -0,0 +1,11 @@
+module BumbleberryOverrideHelper
+  MODERN_FEATURES = [:css3_boxsizing, :css_sel3, :flexbox, :css_grid, :svg].freeze
+
+  def capable_of(capability)
+    if MODERN_FEATURES.include?(capability)
+      true
+    else
+      super
+    end
+  end
+end