Unzip the archive

Hi!

I unzipped the archive and made some minor changes to the readme file (tab in the file manifest code block).
I also renamed the original readme as changelog and I kept the readme that was zipped as the main readme in the repo.

This way, it will be easier to contribute to the project.

On a side note, it is better to use tags to create downloadable archives (and github will create the archives automatically). To do that, create a new tab and push it to the repo, like this:

    git tag -a v2.3b -m 'Beta Version 2.3'
    git commit --tags