Added 'Future improvements' area
Corrected mistake in dependencies, changing IE <= 8 to 9
added two examples and some explanation between two techniques that can be achieved via picture
Merge pull request #8 from PeteSchuster/master

Examples and Additional Images
Added picture spec features: <picture srcset=''>, <picture src=''>, <source srcset=''>, picture's currentSrc read-only attribute as pictureCurrentSrc property. Moved media query addListener support to _addMediaListener function triggered by window.resize event. General clean code clean up. Advanced version number to 2.2.0
Remove extra files
Updated to reflect v2.2.0 updates
Updated syntax of picture source to reflect v2.2.0 changes
Merge pull request #7 from weblinc/master

Pulling in version 2.2.0