How to get markitup editor using label set, send markdown instead of html

I use rails and have a markItUp editor using the special Markdown suite. The only thing I can’t understand is forcing it to send the original Markdown instead of the converted html. I plan to store both formats, but I did not find anything capable of parsing html back to markdown. I set up the set.js label set as we don’t need the whole set of formatting options. Here:

myMarkdownSettings = {
previewParserPath:  '',
onShiftEnter:       {keepDefault:false, openWith:'\n\n'},
markupSet: [    
    {name:'Bold', key:'B', openWith:'**', closeWith:'**'},
    {name:'Italic', key:'I', openWith:'_', closeWith:'_'},
    {name:'Bulleted List', openWith:'- ' },
    {name:'Link', key:'L', openWith:'[', closeWith:']([![Url:!:http://]!] "[![Title]!]")', placeHolder:'Your text to link here...' }
    ]
}

And here is the onready code for the page where the markitup elements appear:

$.editable.addInputType('markitup', {
    element : $.editable.types.textarea.element,
    plugin  : function(myMarkdownSettings, original) {
        $('textarea', this).markItUp(myMarkdownSettings);
    }
});

$('.editable').editable({type : 'markitup'});

This works, but it is an html. I tried to use wmd, because there is an option for output, which supports markdown text as is, but could not get it to fly. Thank.