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* 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".
macholib can be used to analyze and edit Mach-O headers, the executable format
used by Mac OS X.
It's typically used as a dependency analysis tool, and also to rewrite dylib
references in Mach-O headers to be @executable_path relative.
Though this tool targets a platform specific file format, it is pure python code
that is platform and endian independent.
