(maint) test-installer.ps1 PowerShell msi tester

 - simply run test-installer.ps1 to have 14 different installer
   command line parameter variations executed / tested including:
   - no parameters
   - accounts using . as a domain
   - accounts using the local hostname as domain
   - LocalService
   - NetworkService
   - variations of installer startup type
Merge pull request #62 from Iristyle/maint/master/test-installer

Simple test script for built MSI