work in progress, add fidelity to category group permissions (full, create posts, readonly)

spec/models/site_spec.rb

@@ -0,0 +1,16 @@
+require 'spec_helper'
+require_dependency 'site'
+
+describe Site do
+  it "omits categories users can not write to from the category list" do
+    category = Fabricate(:category)
+    user = Fabricate(:user)
+
+    Site.new(Guardian.new(user)).categories.count.should == 1
+
+    category.set_permissions(:everyone => :create_post)
+    category.save
+
+    Site.new(Guardian.new(user)).categories.count.should == 0
+  end
+end