Add ability to autodiscover, or explicitly pass application version number

[JoshuaColeman]

I have been using the NLog.Raygun NuGet package recently and found myself wanting an ability to specify application version in the adapter configuration. I have provided two options:

• Automatically detect the application version from an executing assembly (command line app, etc), or the first non ASP.Net assembly (web app).
• Explicitly specify an ApplicationVersion in the NLog configuration.

I updated the README.md and examples.

[JoshuaColeman]

@dwnz: If a new NuGet package is going to be cut, the references to raygun should be updated.

[dwnz]

Hey @JoshuaColeman,

Thanks heaps for submitting this! Looks good.

Just one note - would you mind changing the ?. to old fashioned null checks. We don't publish a nuget package for this as it's owned by someone else, so needs to be as compatible as possible.

Cheers,
Daniel

[JoshuaColeman]

@dwnz: Heh, I thought about that possibly being an issue after creating the Pull Request. Changes are in.

[dwnz]

@JoshuaColeman No worries! One day we'll all be able to use modern language features :)

Thanks heaps for this! Merging in now