fixed issues with testnet and createTx
custom changeAddress for wallet.createTx()
added tests for createTx testnet and createTx custom changeAddress
custom changeAddress has full integration test
fixes integration test dependency paths
add integration test script
Merge pull request #170 from dcousens/bufferx

BufferExt and Transaction serialization to use Buffers
move fixture sync script into fixtures folder

Also fixes require paths & dev dependency
Merge pull request #159 from williamcotton/master

fixed issues with testnet and createTx
Fixes indentation for assertions
Clarifies Transaction.addOutput param documentation
Fixes Transaction.addOutput(Address, Number)
Fixes network support for TxOut
Extends test for custom Wallet change addresses
Merge pull request #172 from dcousens/ext159

Extends #159 to further verify behaviour
Transaction: fix incorrect outIndex type
Renames hashTransactionForSignature to hashForSignature
HDWallet.derive now adheres to BIP32 correctly
So much