change default to use public PeerJS server

...so that when people run things, it works the first time without having to
change the config.
make things easier to install

mv config to root directory, and improve README
add simplest possible express server to host files

...this is much better for development, so you can run many different servers
that have different HTML 5 local storages for testing purposes.
Merge pull request #101 from ryanxcharles/feature/improve-default-config

Improve default config + Add local express server + Update README