JHOVE v1.22 Release Candidate

Rough release notes:

• Permanent and unique identifiers for all standard JHOVE modules
  • updated message handling system to implement error ids
  • backwardly compatible with existing modules
    • ids only show for messages that have them
  • allows translation of error messages by providing files for different locales
• module independence
  • modules in individual Maven projects
  • module jars now separate from application fat jars
  • individual modules can be kept or updated allowing the user to mix and match
  • ASCII & UTF-8 modules refactored and updated with unit tests
  • begun refactoring of Module class system
• Update to coding standards
  • use of named constants
  • tidied use of generics
  • tidied exception handling
  • removed unused code and variables
  • less code
• upgraded to Java 8
  • use try with resources to ensure files and streams get closed
  • using genuine enum types
• improved testing regime while exposing its limits
  • more test files for AIFF-hul, JPEG2000-hul and TIFF-hul