Log Message:
macholib 1.7
------------
* Added support for ARM64, LC_ENCRYPTION_INFO_64 and LC_LINKER_OPTION
* Load commands now have a "describe" method that returns more information
  about the command.
* The MAGIC value in the header was always represented in the native
  byte order, instead of as the value read from the binary.
* Added various new constants to "macholib.mach_o".