Support multiple servers and configurations

[TrojanerHD]

Modifying the current ChannelUpdater and Leaderboard classes to support multiple servers and configurations.
#10

[TrojanerHD]

In #12, a wrapper for the SQLite database was added.
Now an implementation for the wrapper is required

[LeMoonStar]

I think issue #13 should be implemented before this one. You should be able to set the configuration, before trying to use it, because testing without actually being able to set any configuration values is pretty annoying.