Message/API rename: sendUserMessage -> sendNymMessage.
Message/API rename: getRequest -> getRequestNumber.
Message/API rename: deleteUserAccount -> deleteNym.
CREATE_USER_ACCT-> REGISTER_NYM.
Message/API rename: getTransactionNum -> getTransactionNumbers.
Message/API rename: sendUserInstrument -> sendNymInstrument.
Merge pull request #442 from benma/renamings

Message/API renamings