Add a Railtie stub
Configuration: Use Forwardable to simplify getter/setter
Railtie: Load database config
Added empty rake file for Railtie compliance
spec_helper.rb: Using YAML based database configuration
Merge branch 'add-rails-compability' into unstable

* add-rails-compability:
  spec_helper.rb: Using YAML based database configuration
  Added empty rake file for Railtie compliance
  Railtie: Load database config
  Configuration: Use Forwardable to simplify getter/setter
  Add a Railtie stub