* master: (33 commits)
  fixed typo
  fixed typo
  fixed Client::request() method usage
  fixed previous commit
  added a note about third-party libraries
  made some minor edits
  added a new best practice for bundles
  added a note about configuration format in the best practices
  added guides about bundle best practices and configuration
  translated Standards.markdown into Japanese
  fixed typo
  fixed typo
  fixed typo
  added a chapter on submitting patches
  added a chapter on coding standards
  moved contribution docs to its own sub-directory, added some doc about security and bugs
  rewrite the event dispatcher overview
  Fixed doctrine.odm.mongodb.document_manager reference
  tweaked the Twig tutorial
  Renamed Symfony 2.0 to Symfony2 in the Validator guide
  ...