Add server-side logging support

[rpmansion]

I'm submitting a...

• Bug report
• Feature request
• Documentation issue or request

Current behavior

Currently logging can only achieved by going to browser developer console.

Expected behavior

It would be great if this logging can integrate server side logging by default as some user is used Angular and AspNet Core. This can be achieved using JSNLog.

Minimal reproduction of the problem with instructions

Environment

- generator version: 5.3.0
- node version: 9.5.0
- npm version: 5.6.0
- OS:  Windows 10 Pro x64

Others:
Link for JSNLOG: http://www.jsnlog.com/Documentation/HowTo/Angular2Logging

[bursauxa]

While it is an interesting topic, it is very much specific to only one server technology. I am unsure whether this would exceed the scope of ngx-rocket. Any thoughts @sinedied ?

[sinedied]

Indeed, specific solutions like these could/should be implement by userland add-ons, especially as the current provided logger can be extended easily with other outputs, see #154