failsafe script to force nuget packages to download in case xbuild won't update. Updating README on mono + nuget
adding packages.config to GitExtensions.Mono, now NBug is part of Nuget
Merge pull request #1709 from fraga/fixMonoProject

adding packages.config to GitExtensions.Mono, now NBug is part of Nuget
Merge pull request #1708 from fraga/NugetMono

Adding script to manually update nuget, updating README
WiX, git-rev-parse links updated