Responsive images with Picture module and Media in WYSIWYG

Hi,
thank you for your reply. I am using a subtheme of the Omega 3 them but could reproduce the issue with Bartik. So i think this is not a theme problem.

I updated all involved modules to their latest releases and finally figured out how it could work.
I had to remove the "widget" plugin (in contrast to the recipe above) to get the button "Picture properties" (alongside the "Media settings") if I right click on an image. This way I can select the image size (breakpoints) supplied by the picture model.
Problem is, that the images get locally set width and height attributes as shown below:

<picture data-picture-mapping="aaa" class="media-element file-default" data-delta="8" typeof="foaf:Image" width="567" height="425">
...
<img data-picture-mapping="aaa" class="media-element file-default" data-delta="8" typeof="foaf:Image" width="567" height="425" data-aspectratio="" srcset="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7 1w" alt="" title="">
...
</picture>

This way the size set by the picture module is ignored and therefor not responsive.
Is there any way to get rid of the width and height attributes, maybe through a separate module?
Thanks for the help!

I figured this has been discussed in the picture issue queue. A workaround would be to add this css to my theme.

picture img {
    width: auto;
    height: auto;
}

as suggested in #14 here.

But I am not sure what is the right way to fix this? Remove the width/height attribute in the media module (is it needed?) or the add the css in the picture module? Maybe a configurable setting of http://docs.ckeditor.com/#!/api/CKEDITOR.config-cfg-image_prefillDimensions would be possible.

Thanks kalabro for your reply. But I think this is a bit different issue. I have no problems inserting the image in the wysiwyg area as I choose "image" not "picture" in the file image display config. Then I used the picture popup dialog when right clicking on the image after it was inserted (remember widget plugin for ckeditor needs to be disabled) and select the required size here.