Added Templates: IIS Application Pool - Create / IIS Application Pool - Delete

Now you can create application pools individually, as well as delete them. 

Combined with the existing _IIS Application - Create_ template, you can now create IIS Applications / Virtual Directories each with separate Application Pools. It also configures App Pool credentials (among other basic settings). This closes a gap in functionality that was preventing our website structure from being automated.

IIS Application Pool - Create:
Creates or Reconfigures an Application Pool, including Name, Identity
Type, User Credentials, AutoStart, CLR Version, Pipeline Mode

IIS Application Pool - Delete:
Deletes the specified application pool.