Description

Adds support for MangaNelo
Fixes #326

Type of change

• Support for a new site.

Checklist:

These don't have to be all checked, but if you can it would be very helpful.

• If this is supporting a new site, have you done everything mentioned in the "Supporting New Sites" wiki page?**
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have added tests that prove my fix is effective or that my feature works

I added the test file but could not run it on my end, travis should run them. I did run the modifications using the docker dev environment, and successfully tracked mangas from Manganelo.
I pretty much copied the files used for Mangakakalot since the websites are similar.