Check IIS modules upon installing

[roycornelissen]

After installing the Augurk WebDeploy package, I got 405 Method Not Allowed errors from IIS on some DELETE calls. They were caused by the WebDavModule being present in the IIS application. The installer should check and delete the module if present. Request filtering may also hinder the API, when the DELETE verb is blocked. On application level, DELETE should be allowed, maybe best if it's done explicitly.

[marktaling]

This should be resolved by implementing #36, which eliminates the need to use IIS at all.

[marktaling]

This will be resolved as part of #58.