RCR 341: Let Kernel#require take multiple arguments

  require 'foo'
  require 'bar'
  require 'xyzzy'

or iterate an array of libraries (doesn't work too well with rdoc),

  %w[foo bar xyzzy].each {|lib| require lib }

Although this works fine, it feels natural that require should be able to take multiple arguments. In Python for example, it is perfectly valid to

  import foo, bar, xyzzy

  require 'foo', 'bar', 'xyzzy'

which will also make this possible,

  require %w[foo bar xyzzy]

I think this leads to cleaner syntax; you can load multiple libraries on a single line without resorting to iterators.

  module Kernel
    alias :old_require :require
    def require(*libs)
      libs.each {|lib| old_require lib }
    end
  end