Adds srcset extension.
Ensures Picturefill still works as expected sans `srcset` extension; minor cleanup
It *probably* makes sense to only do the `srcset` thing when there’s a `data-srcset` attribute specified, but I’m no expert on responsive images.
fix link captions in README
Check if picImg is already a child of matchedEl

In working on some local modifications to picturefill (which I hope to submit as a PR at a later time), I noticed some jerkiness when resizing the page. I found that the end action where the code changes the `src` and re-appends the element were the source of the problem.

Since these actions are unnecessary if we are not changing the image, this adds a `continue` if the image's parent node is already `matchedEl`.
Should use max-DPR, per the spec. Not that I agree.
Restores full srcset demo.
Fixed small type errors in the README
Added a note in the readme regarding deferred loading of picturefill.
Merge pull request #101 from ralcus/master

Added a note in the readme regarding deferred loading of picturefill.
Merge pull request #94 from PizzaBrandon/master

Check if picImg is already a child of matchedEl
Merge pull request #93 from goldsmith/master

Fix link captions in README to use markdown syntax
Merge pull request #100 from jelmerdemaat/master

Fixed small type errors in the README
Add temp fix for IE attribute issue

A messy fix which removes the width and height attributes automatically added when img element is created in IE < 9
Change out hasAttribute for getAttribute for better backward support
Remove checking for width and height attributes, to reduce overheads in IE
Merge pull request #106 from davebeesley/master

Add temp fix for IE attribute issue
Update src in noscript

image src should be the same as in data-src
Merge pull request #110 from maxklenk/master

Update src in noscript
Update bower.json