Log Message:
Update to 0.6.0:

New features (compared to 0.5.0):

    * Brand-new "virtual" multi-pass optimizer that automatically
      generates much smaller code for jumps and immediates.
    * Support for Mach-O object format used in MacOS X, including
      both the 32-bit (x86) and 64-bit (AMD64) versions (contributed
      by Henryk Richter).
    * Support for structured exception handling on Win64.
    * Support for RDOFF2 (.rdf) object format.
    * Support for STRICT keyword in NASM syntax.
    * Rewritten NASM and GAS parsers (now recursive descent rather
      than Bison-based).
    * Absolute / FAR location bugfixes.
    * Yasm no longer defaults to reading from standard input if no
      files are specified; standard input can be specified with "-".
    * Many other bugfixes.