Removing panopoly image style override that removes the panopoly floatin...

RE: https://www.drupal.org/node/2353831

At first I was going to create a patch for the Radix theme but that would have only fixed the css and not the scss that generates it... so hoping this is the right place.

I don't know if this is left over from radix 2.x or not, but radix is removing the floats, etc. that are used to float images left and add a margin to the content next to the image. I wasn't sure if there is a bootstrap reason for that or not. Here's a screenie and the css I've identified.

```css
/* line 9, ../../extensions/compass_radix/stylesheets/compass_radix/_node.scss */
.field img.panopoly-image-full,
.field img.panopoly-image-half,
.field img.panopoly-image-quarter {
  max-width: 100%;
  width: auto;
  height: auto;
  float: none;
  margin: 0;
}
```

![Image of panopoly content list losing floated images](https://www.drupal.org/files/issues/panopoly_radix_layouts_radix_theme.jpg)