v1.1.1

• Add logger configuration settings and factory
• Add json patch and pointer implementation. The accessor uses now also the json
  pointer syntax
• Add record serializer and add transformer which builds a record graph from
  arbitrary data
• Add option to attach a validator to the importer inside a controller
• Make ImporterManager immutable so that it is not possible to globally change
  a importer object
• Improved validator
• Renamed some classes for PHP7 compatibility
• Removed class PSX\Data\Object and added static factory method fromArray to
  PSX\Data\Record
• Adjust visitor exception messages