Removed a load of JSONS to make testing easier
Updated RNG

Ideally, the random number generation needs to work by shuffling the list of commons and then just picking the first 7/8. Just picking elements at random means you could get the same one twice or more.
Added shuffle method
Remove the .json from the dictionary name
Changed to instance-based arrays for the sets

Fixes #3
Quick cleanup ready for merging
Think the merge is done?