WIXBUG:1705 - Include AssemblyFileVersion in MsiAssemblyName table.

After discussing with CLR team, including the AssemblyFileVersion when
installing into the GAC makes a lot of sense to them. Historically the
documentation did not highlight including the AssemblyFileVersion but
most (all?) Microsoft already products seem to inclue file version.
Merge pull request #25 from robmen/bug1705-assemblyfileversions

WIXBUG:1705 - Include AssemblyFileVersion in MsiAssemblyName table.