Removing mybb config and moving mockdata

I believe that it will be best to store mockup data inside the Model of MyBB as there are only 8 array entries with small amount of data and this wont be a problem for the model. 
In second hand myBB config is almost pointless with just 3 params so I moved them inside the global config file (with mybb_ prefix). This way there is no need of loading it.