Ensure #each is called on an Array for Ruby 1.9

String#each does not exist in Ruby 1.9 and Rack requires the
body object respond to #each

lib/cramp/controller/body.rb

@@ -30,7 +30,7 @@ def flush
         return unless @body_callback
 
         until @queue.empty?
-          @queue.shift.each {|chunk| @body_callback.call(chunk) }
+          Array(@queue.shift).each {|chunk| @body_callback.call(chunk) }
         end
       end
 
@@ -40,7 +40,7 @@ def schedule_dequeue
         EventMachine.next_tick do
           next unless body = @queue.shift
 
-          body.each {|chunk| @body_callback.call(chunk) }
+          Array(body).each {|chunk| @body_callback.call(chunk) }
           schedule_dequeue unless @queue.empty?
         end
       end