Ref. #188 - The way this is parsed won’t allow types and such anyway, so I updated the comment to make sense. We might just want to document this better.
Closes #188 - If no length was selected, default to `100vw` (per the spec). Using 100% here for the sake of compatibility in older browsers.
Add distinct demo pages

This pull request adds demo pages for each distinct code
sample. This allows users to see the effect of resizing
the window on the photo without large quantities of text
pushing the image off the page.
Merge branch 'split-out-demo-pages' of github.com:commadelimited/picturefill into commadelimited-split-out-demo-pages
Favicon.
parse srcset urls with commas close #191
move stub resets to setup and teardown