$ rails app_name -m http://github.com/svenfuchs/adva_cms/raw/master/templates/adva-cms.0.3.0.rb
...
Switched to a new branch 'tag/0.3.0'
rake adva:install:core -R vendor/adva/engines/adva_cms/lib/tasks
rake aborted!
no such file to load -- action_mailer