MosaicNonce uses inconsistent serialization/deserialization between byte[] and numbers

[tonowie]

MosaicNonce createFromBigInteger(BigInteger number) method uses little endian when converting big integer to byte array (nonce)

int getNonceAsInt() on the other hand uses big endian to convert byte array to int

this inconsistency creates confusing situation when making invocation like this
createFromBigInteger(BigInteger.ONE).getNonceAsInt()
One would expect this to return 1 but it does not because of the mismatch