Allow spaces in the path to the "choco" command.

The default directory where Chocolatey installs changed to
be "CommonApplicationData". On new versions of Windows this is
"C:\ProgramData", on older versions of Windows (XP, 2003) this is
"C:\Documents and Settings\All Users\Application Data".
Merge pull request #23 from 7digital/allow_spaces_in_chocolatey_path

Allow spaces in the path to the "choco" command.