(#59) - Update Fauxton with new branding

Also update README to note Fauxton branding and PouchDB.defaults API.

So @nickcolley I got ya started.  For now the logos are pretty basic (my amazing GIMP skills are at work here), but feel free to run with it.  Fauxton fork is noted in the README, and that fork has a new README with info specific just to PouchDB Server.