reset entropy to being a one stage process
Merge branch 'master' of github.com:Siacoin/Sia into demofix
Merge pull request #113 from DavidVorick/demofix

Remove 2 stage entropy
Add Close() method to MessageRouter
Add Quorum type
change Ring fields
update erasure for new Ring
use global vars and new Ring in client
update client test
inline messages
reorganize Ring again
update erasure for new Ring
update client for new Ring
update tests for new Ring
rename mr -> router
update comments
remove randomplacement
remove SetAddress and updateParticipant
Merge pull request #112 from lukechampine/rpc

Changes to Ring
Break state into quorum and participant

The old 'participant' got renamed to 'Sibling'
the new participant contains information that is only held by that one
participant.
The new quorum contains information that is held by all siblings in a
quorum.