Tweaked the README to be a bit more friendly and detailed

I thought the README could use some love, so I added some details about licensing and also detailed out procedures for downloading and building the project.

In addition I added a bit to the "What do you get" paragraph and tried to tighten it all up some.
I removed the link here because, yes, it lands on a login page which conveys zero information to anyone. We could change this to indicate something like "you'll need an account" or whatever - but even then what's the point of it?