RCR 341: Let Kernel#require take multiple arguments

Let Kernel#require try to load all the specified libraries.

Kernel#require can only load one library per call. So either we write several require calls,

  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

My proposal is simple:

  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.

Would not break backwards compatibility.

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