Making the Ruby bogosort more idiomatic (#437)

* Idiomatized

is that even a word?

* More idiomaticity

I don't think that's a real word, either

* Update bogo_sort.md

Author: Nic Hartley

contents/bogo_sort/bogo_sort.md

@@ -44,7 +44,7 @@ In code, it looks something like this:
 {% sample lang="nim" %}
 [import:16-18, lang:"nim"](code/nim/bogo_sort.nim)
 {% sample lang="ruby" %}
-[import:12-16, lang:"ruby"](code/ruby/bogo.rb)
+[import:7-9, lang:"ruby"](code/ruby/bogo.rb)
 {% endmethod %}
 
 That's it.

contents/bogo_sort/code/ruby/bogo.rb

@@ -1,31 +1,19 @@
 #!/usr/bin/env ruby
 
 def is_sorted(a)
-  for i in 0...a.length-1
-    if a[i+1] < a[i]
-	  return false
-	end
-  end
-  return true
+  a.each_cons(2).all? { |(l, r)| l <= r }
 end
 
 def bogo_sort(a)
-  while !is_sorted(a)
-    a.shuffle!
-  end
+  a.shuffle! until is_sorted a
 end
 
-def main()
-	a = [1, 1, 0, 3, 7]
-	
-	puts("Unsorted")
-	print(a)
-	
-	bogo_sort(a)
-	
-	puts("\n\nSorted")
-	print(a)
-end
+a = [1, 1, 0, 3, 7]
+
+puts "Unsorted"
+p a
 
-main()
+bogo_sort a
 
+puts "Sorted" 
+p a