Change de default buffer size to 4K (tipical block size for filesystems).
Remove ext4 simple tester class.
User java ByteBuffer to make number conversions.
Minor change in position calculation.
Use only one buffer and add an option to keep the buffer aligned.
throw exception if byteorder == BIG_ENDIAN in getNumber, as it is not implemented yet.
Reimplement getNumber and getUnsignedNumber in BlockReader, in order to honor the provided byte order.