• [rt.cpan.org #56740] Format Perl versions >= 5.6.0 as X.Y.Z (schwern)
  
• Functional interface amended to make calling conventions consistent
  (bingos)
  
• Documented all functions and all hash structures (bingos)
  
• Fixed functions with edge-case involving querying for Module::CoreList
  itself. Pointed out by Ilmari.
  
• Added removed_from() and removed_from_by_date() functions
  for querying which release a module was removed from core. (bingos)
  
• Amended corelist utility to use new removed from functions when
  stating when a module entered core ( and when it left it ). (bingos)
  
• Added tests to the testsuite to cover the edge-cases and new funcs. (bingos)