addressed testing of psbuild module installation and import

Ok, I took a look and I think this is what you're after.  Get-Module 'psbuild' checks for a module named PSBUILD that is already loaded in the current session.  This is a valid check, you need to do this because I don't see you importing the module explicitly anywhere.  

Get-Module -listavailable 'psbuild' checks for modules named PSBUILD that are INSTALLED and ready for import.

I modified the code using the convention I'm familiar with.  Discuss.