• Add YAML::PP::Common; use constants for YAML styles
  
• Add YAML::PP::Schema::Perl - Dump perl objects, coderefs etc.
  
• Add YAML::PP::Schema::Tie::IxHash - keep order of hashes
  
• Add YAML::PP::Schema::YAML1_1
  
• Add class_isa representer (PR#7 @pplu)
  
• Add exceptions in tests for broken inf
  
• Refactor schema testing
  
• Fix indent bugs in emitter (aliases, empty lists/mappings)
  
• Fix bug in emitter for values starting with '? ' or '- '
  
• Add missing resolvers to Core and YAML1_1 Schema