Add Password parameter, and change Test-TargetResource to match the Subj...

Add Password parameter, and change Test-TargetResource to match the Subject name, instead of looking for equal to.

This has been tested on Windows 2008R2 and 2012R2.
This is to support matching a wildcard certificate, such as *.mysite.com. 
Possibly a better method would be to match on a Thumbprint, instead of a certificate name. Thoughts?