Web api for dynamically adding checks

..and dockerfile that is a bit more efficient at rebuilding python changes

This is still a WIP but I would like to get a bit of feedback
I don't know how to do it. I'm using lpush + ltrim in another application, it works fine. As a last resource we can change the code to use rpush, but we will need to change also the Go web-server (easier and faster) or the Javascript code to reverse the results in all HTML pages.

Anyway, this is a feature I want to see. We can set it at configuration files with a parameter, something like `results_to_keep = 1000`.