0.24.0
 remove __dir__ (deemed too confusing, since it would seem to imply that __file__ also exists, which it doesn't)
 change __DIR__ from /a/b/ to /a/b (also confused me once, can't have that!)
 add Numeric#group_digits(',')

#     3: add hash_set_operators
  # 0.2.2: add Regex+Regex, bug fixes
  # 0.2.0:
  #       add irb simple prompt, auto indent by default [sane defaults!]
  #     1: add $: << '.', don't do Hash#hash on 1.9
  # 0.1.
  #     9 add irb autocompletion on by default [if you're in an IRB session, that is]
  #     8 add Hash#hash
  #     7 add File.binwrite
  #       rename aliaz alias_h [ for alias hash ]
  #     6 add File.binread [1.9 has it, 1.8 not]
  #     5 remove #sum method [not rails compat]
  #     4 add _dbg as a file
  # 0.1.3 require 'pp' with _dbg
  # 0.1.2 add singleton_class
  # 0.1.1 add aliaz