Don't ignore blank lines in the output

This fixes the stdout code to ensure that empty lines are outputted.
Many times, these blank lines are intentional, so foreman should not
suppress them.

This fixes #286

lib/foreman/engine/cli.rb

@@ -54,7 +54,7 @@ class Foreman::Engine::CLI < Foreman::Engine
   end
 
   def output(name, data)
-    data.to_s.chomp.split("\n").each do |message|
+    data.to_s.lines.map(&:chomp).each do |message|
       output  = ""
       output += $stdout.color(@colors[name.split(".").first].to_sym)
       output += "#{Time.now.strftime("%H:%M:%S")} #{pad_process_name(name)} | "