Standardize names of entities

[jtremback]

In althea.sol I see "user" "member", it should be node. Don't let the use case of the Clatskanie DAO make you think that every node will be a member like they are doing it. Most deployments will probably have a large number of nodes stored in our app, administered by a smaller number of organizers, whose info will be stored in aragon's stuff.