Major Revision of Get-GPPPasswords

Thanks @obscuresec!
Update Get-GPPPassword.ps1

Bug fix of variables.
Update Get-GPPPassword.ps1
Update Get-GPPPassword.ps1

Iterate version.
Changed the direction of XML parsing

Used Select-XML to ensure compatibility with v2
Update Get-GPPPassword.ps1
Update Get-GPPPassword.ps1
Merge pull request #32 from obscuresec/master

Minor fixes for compatibility between versions
#31 Persistence module function nouns are now singular

The function names New-UserPersistenceOption and
New-ElevatedPersistenceOptionNew-ElevatedPersistenceOption now conform
to PowerShell naming best practices.
Consolidated Persistence module functions into Persistence.psm1

It doesn't make sense to have these as separate ps1 files.
Update