AspNet.OpenRastaModule always defaults to IIS6, even for IIS7

[HCanber]

OpenRasta.Hosting.AspNet.OpenRastaModule.VerifyIisDetected ()ignores ServerVariable and defaults to IIS6, even for IIS7.
The problem is this line:

internal const string SERVER_SOFTWARE_KEY = "SERVER_SOFTWARE_KEY";

Should be:

internal const string SERVER_SOFTWARE_KEY = "SERVER_SOFTWARE";

The invalid line causes VerifyIisDetected() to skip the entire if-slashpos-then-parse-server-software-branch so iisversion is not set which causes Iis to default to new IIS6()