Releasing 2.0.5

Fixed a bug when calling directly the window.picturePolyfill() function
Added performance info
Updated performance info
Removed test pic ie8 html file
Added "follow" button on demo
Add ability for window.picturePolyfill to accept an element as stated in the read me
Merge pull request #3 from DEfusion/master

Add ability for window.picturePolyfill to accept an element as stated in readme
gitIgnore + karmaTests
Merge branch 'master' into gh-pages