Add 'Minecraft PHP Client 2' library.
Create 'Client' library.

This will contain all the functions from the Minecaft Client later.
Need to modify the library because of errors.
Add 'ping' function to client library.

Allows to get name, online users and max users from a minecraft server in real-time!
Fix bug causing to ping wrong host.
Display real users ingame on dashboard!
Fetch minecraft host and port from config file.
Merge branch 'feature/minecraft_client' into develop