Fixed to use new syntax
updated to picturefill 2.1
Fixed to use new syntax
Fixed to use new syntax
removed unused demo
added a variable width demo
fixed up example a bit
fixes suggested by @zcorpan
src should be srcset
Merge pull request #62 from ResponsiveImagesCG/updates-demos

Updates demos (closes #61) 
Merging so we can push this out. We can fix other bugs separately.