Add wheel support

As @hynek said "it's 2013 and wheels are cool."

Update changelog

Update changelog

Update release date

The 0.4 release is being done early to address a critical bug in 0.3 which was fixed in d322d53.

Update the change log

Remove unused import

The `Collection` class is being removed because it is no longer needed as a result of 5abf612. It could have also been removed as a part of c29ecbd.

Update the README

The docs are meant to serve as the primary source for learning how to use Simon, but I felt it important to get the basics in the README.