Description of problem:
When an exception is raised in conductor, html_error_page in application controller tries to render layouts/error page. There is no this template defined, so no error is displayed. Backtrace:

ActionView::MissingTemplate (Missing template layouts/error with {:formats=>[:html], :locale=>[:en, :en], :handlers=>[:erb, :builder, :haml]}. Searched in:
  * "/home/jprovazn/devel/conductor/src/app/views"
):
  app/controllers/application_controller.rb:95:in `html_error_page'
  app/controllers/application_controller.rb:83:in `handle_error'
  app/controllers/application_controller.rb:82:in `handle_error'
  app/controllers/application_controller.rb:73:in `handle_general_error'


We should add layout/error and layout/popup-error templates.