Support for powershell 2.0 (default version in windows 7) (or document which versions are supported)

Hi, congrats for the new windows support. I've tried to run the bootstrap executable in windows 7 and i've got an error about missing powershell definitions. I guess the builtin powershell version of windows 7, 2.0 is not compatible with the tool usage (does it expect powershell-3.0, i guess?).

PS D:\> [System.Environment]::OSVersion.Version

Major  Minor  Build  Revision
-----  -----  -----  --------
6      1      7601   65536


PS D:\> Get-Host | Select-Object Version

Version
-------
2.0

PS D:\> .\bootstrap-haskell-1.0.1.exe

Excepción no controlada: System.IO.FileNotFoundException: No se puede cargar el
archivo o ensamblado 'System.Management.Automation, Version=3.0.0.0, Culture=neu
tral, PublicKeyToken=31bf3856ad364e35' ni una de sus dependencias. El sistema no
 puede encontrar el archivo especificado.
   en PowerShellToolsPro.Packager.ConsoleHost.Program.Main(String[] args)