remove polyfill
update description
More polyfill friendly approach
clearify documentation
Code cleanup

Bumped in version to 2.0.0. Deleting the old polyfill branch given less than 1% of users (excluding China) use IE7 or below.
Merge branch 'master' into modern

No longer includes a basic polyfill. Web Storage is supported by IE8 and above. Less than 1% of users use IE7 or below (excluding China). You can use this in conjunction with your own polyfill if you require support for IE7 or below.