* lib/getopts.rb: Rewrite to fix some bugs and complete features.

  - Accept options with the colon in the first argument;
    getopts("a:bcd:") is equivalent to getopts("bc", "a:", "d:").
  - Do not discard the argument that caused an error.
  - Do not discard '-', which commonly stands for stdin.
  - Allow specifying a long option with a value using '='.
    (command --long-option=value)
  - Stop reading options when it meets a non-option argument.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@2163 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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