Updates the readme to include the dependencies for the dependencies, if you will.
Resolves issue #274 by adding some documentation about the storage attribute, including a link to the correct spot in the docs. Also fixes some invalid HTML I stumbled upon.
Corrects a few typos and addes a new <section> that explains how to set up multisites. I haven't tested this documentation, but I expect with some minor modifications you'll be able to make it correct if it's not already.