Refactor abilities. Added ProjectUpdate context. Fixed few bugs with namespaces

app/contexts/project_update_context.rb

@@ -0,0 +1,21 @@
+class ProjectUpdateContext < BaseContext
+  def execute(role = :default)
+    namespace_id = params[:project].delete(:namespace_id)
+
+    if namespace_id.present?
+      if namespace_id == Namespace.global_id
+        if project.namespace.present?
+          # Transfer to global namespace from anyone
+          project.transfer(nil)
+        end
+      elsif namespace_id.to_i != project.namespace_id
+        # Transfer to someone namespace
+        namespace = Namespace.find(namespace_id)
+        project.transfer(namespace)
+      end
+    end
+
+    project.update_attributes(params[:project], as: role)
+  end
+end
+