Critical protocol changes
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Mon Apr  8 16:13:12 PDT 2013
* The JSON field "inLedger" changing to "ledger_index"

Previous
* The JSON field "metaData" changing to "meta".
* RPC ledger will no longer take "ledger", use "ledger_hash" or "ledger_index".
* "ledgerClose" events:
** "hash" DEPRECATED: use "ledger_hash"
** "seqNum" DEPRECATED: use "ledger_index"
** "closeTime" DEPRECATED: use "close" or "close_human"
* stream "rt_accounts" --> "accounts_proposed"
* stream "rt_transactions" --> "transactions_proposed"
* subscribe "username" --> "url_username"
* subscribe "password" --> "url_password"
