Fix .Net 3 Requirement

[abombss]

Windows 8 and PS 3 don't have .net 3 installed by default.

Change the PesterFailure.ps1 file not use a specific .net version. I assume specifying just -language CSharp runs on whatever framework is currently the powershell host.

So changing

Add-Type -language CSharpVersion3 @'

to

Add-Type -language CSharp @'

worked fine for me on Windows 8 without .net 3 installed, not sure if this breaks other platforms or not.

[scottmuc]

Thanks for reporting this. Will be doing some housekeeping stuff today and will roll this in.