[IIS] Support for Application resource

As an IIS Administrator
I want define a puppet resource with the following features

• Convert an IIS virtual directory to application
• Create an IIS application
• Remove an IIS application
• Update an IIS application
• Get all IIS applications

So that I can manage an IIS application with Puppet.

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The working assumption is that the IIS Module will be built off of the IIS Cmdlets.

Features to be implemented are

• Convert IIS Virtual Directory to IIS Web Application
• Create
• Remove
• Get Web Application state?

The following Cmdlets may be implemented for this feature:
ConvertTo-WebApplication
Get-WebApplication
New-WebApplication
Remove-WebApplication