made update-vs2005 script behave mostly the same if running on .Net or mono
prefer .exe in mono so we don't use the system version when BooToolPath is set
changed the targets file to fit xbuild, hopefully it will also work for msbuild
adapted project to latests changes
MSBuild correctly includes the TargetFrameworkMoniker generated file as a source
Reference Boo.Lang.Useful project instead of the assembly
Target .Net 4.0
define MsBuild references in the Nant task
Switch to mono-2.0 when building MSBuild task
Merge pull request #77 from drslump/mono-build-fixes

Mono build fixes