Major change with multiple features

* Virtual Directory Support
* section unlock and lock support
* fixed issue with :add on pool provider not running all config
* fixed issue with :config on all providers causing application pool recycles (every chef-client run)
* moved to better method for XML checking of previous settings to detect changes

I apologize for the large pull request but the speed of approvals is taking too long and we have had to write too much code.
The various local variables here use camelCase, which is generally discouraged in Ruby source code. These should be snake_case instead. E.g.:

```ruby
is_updated = false
application_pool = Xpath.first...
```

And so on.