* Being able to specify commitment on the Client instead of every call.
* Better error handling (more exception details, and specific rate limiting exceptions)
* More obvious return values, instead of always having to dereference "result".
* CombinableTransactions now separated out.
* CombinableTransactions are now size-aware when being executed, and will automatically split into batches for execution if they are too big.
* New MarketInstructionBuilder approach - each market type can now have its own way of building instructions for common operations.
Geoff Taylor