Update to Picturefill v2.0.0
Some initial hacking, to explore the new picture syntax.
Update to latest version of the pollyfill
remove attributes from picture element
remove data width and height attributes
remove data prefix from attributes
remove @2x sizes from the queue
Make the @2x images optional and split the model into a parent application model and a model for individual images
comment out print statement
Basic functionality
Use a single srcset if no @2x images exist
Update to version 2.1.0 beta
remove unneeded array reverse
Initial sizes
Optionn to include original src in image
Clean up some commented-out code
Do not alter the img syntax if srcset is present, but sill enqueue picturefill
Output src as a part of the attribute string
Remove old image_sizes variable
Delete fallback and noscript template