Added example markup and image for gumby-media. Changed from : to | to avoid conflict with media queries
Example gumby-media attribute added in img.html
Uncoupled parse attribute method and support attribute. Both media and support attributes have same syntax so it can handle both
Abstract default image loading out of handleSupports method and into constructor, same logic can be used for both supports and media
matchMedia gumby-media functionality in place
Commented up and tidied images module