LogLevel.Debug for NLog Logger

[ORuban]

It seems like mapping between Microsoft.Framework.Logging.LogLevel and NLog.LogLevel is not fully correct:

• has missed Microsoft.Framework.Logging.LogLevel.Debug
• Microsoft.Framework.Logging.LogLevel.Verbose pointed to NLog.LogLevel.Debug instead of Trace

The main problem is that NLog.Logger.Debug method does not write any logs.
You can check the following PR: #188

[muratg]

@ORuban thanks for the PR! @kichalla Please have a look at the PR and if looks good, merge.

[kichalla]

Commit 0d6b4fc