Added JPEG-2000 and JPEG-XR support, with example (demo-05.html)
Added JPEG-2000 and JPEG-XR support, with example (demo-05.html)
Added .gitignore
restored other file types in .gitignore.
Put tab back to spaces.
Alternative image formats -- not 100% finished (there is a bug still onload).  Supports WEBP, JPEG-XR, JPEG-2000 and APNG.  Includes grunt build task to add support for these (they are optional).  For example:

grunt support-types:svg:webp

builds support for svg and webp in picturefill.  Other strings that add support are jp2, jxr and apng.
Testing grunt task.
Inserted my name.
Fixed grunt task repeating itself.
Fixed bug that doesn't detect alternative formats onload.
Added grunt documentation to the index.html file/
Merge remote-tracking branch 'upstream/master' into alternative-images

Conflicts:
	dist/picturefill.js
	dist/picturefill.min.js
Removed console.log statements.
Put demo of alternative images is demo-04.html
Added information to the APNG example with appropriate caveats about the mime-type not being real.
Refactored picturefill alternative images branch.
Grunt build delete
Removed the extra code setting w.picturefill in the includes, as well as changing exposing the picturefill object globally, no matter if it's an AMD or not.
Merge branch 'alternate-images' of https://github.com/zoltan-dulac/picturefill into zoltan-dulac-alternate-images

Conflicts:
	dist/picturefill.js
	dist/picturefill.min.js
Whitespace fix; restores jscs to default grunt task.