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
Don't let travis build the unstable branch
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
Merge branch 'unstable' of github.com:triAGENS/guacamole into unstable

* 'unstable' of github.com:triAGENS/guacamole:
  Don't let travis build the unstable branch
  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
  Collection: Tiny refactoring
  Query: Feature Done.
  Query: Ensure standard enumerable behavior for first
  Implemented Collection.all
  Implemented Collection.by_example
  Query: Refactoring
  Query: by_example accepts `skip` and `limit`
  Query: `all` should accept skip and limit
  Query is enumerable
  Query: Return an enumerator when no block was given
  Query: Tiny refactoring
  Query: Implemented the case of a provided example
  Query: Implemented `each` for the `all` case
  Collection Queries: Acceptance Spec formulated