Merge pull request #38 from sublimator/develop

Add `SerializedObject.check_no_missing_fields`, fixing regression in checking for `binformat.REQUIRED` fields
Fix endless loop when creating an Account object for a non-existent account.
Fix last commit.
Typo. Fixes #39
Merge branch 'develop' of https://github.com/ripple/ripple-lib into develop
Fix requestTransactionEntry arguments, add flexibility to remote.transaction
Fix ledger index argument to transactionEntry, add flexibility to remote.transaction
Update license
Update license
Emit 'signed' event when transaction is resigned
Don't store complete transactions in TransactionManager sequence cache
Add Transaction.transactionManager getter for convenience
Fix orderbook unsubscribe
requestTransactionEntry arguments
Fix orderbook subscribe
Disable transaction resubmission when remote signing. Throw error when attempt to build_path when using local_signing