Fix/p2p connections

This PR includes the following fixes for the comments on #15

- "Signout" doesn't seem to clear the list of peers. There should be a way to clear local storage and not necessarily reconnect to the same peers.
- The count of how many copayers there were seemed to be inaccurate if I connect and disconnect a few times. Right now one of my browsers says "6/5" copayers.
- If I click "sign out" and then "create wallet" again and again, it keeps adding peers even though I am only one peer. When I create a new wallet, there should be no one connected to it.

:bowtie: