Added the option to disable the "wpautop"

I think it's a good idea to let users decide if they need `wpautop` formating or not. For example this option is available in widgets(text widget) and I why not include and here? 
Cheers and thank you for this great piece of work. 

P.S. I alread filled the cup twice on wpf.org in respect for what you do @sy4mil. ;)