Released version 1.1.0

• added Type::mergeDefaults() [Closes #13, Closes #24, Closes #28, Closes #31]
• added error codes
• ValidationException::getMessageObjects() returns array of Messages
• Allow options to be marked as deprecated [Closes #27]
• Structure: structure with required fields can be optional [Closes #17]
• Type: PREVENT_MERGING prevents merging with defaults [Closes #14, Closes nette/application#257, nette/di#229]
• 'option' changed to 'item' in error messages