Merge pull request #981 from EleutherAI/mmlu-fixes

[Refactor] fixes for alternative MMLU tasks.

lm_eval/tasks/mmlu/flan_n_shot/loglikelihood/mmlu_virology.yaml

 "dataset_name": "virology"
 "description": "The following are multiple choice questions (with answers) about virology.\n\
   \n"
-"group": "mmlu_flan_n_shot_generative_other"
+"group": "mmlu_flan_n_shot_loglikelihood_other"
 "include": "_mmlu_flan_loglikelihood_template_yaml"
-"task": "mmlu_flan_n_shot_generative_virology"
+"task": "mmlu_flan_n_shot_loglikelihood_virology"

lm_eval/tasks/mmlu/flan_n_shot/loglikelihood/mmlu_world_religions.yaml

 "dataset_name": "world_religions"
 "description": "The following are multiple choice questions (with answers) about world\
   \ religions.\n\n"
-"group": "mmlu_flan_n_shot_generative_humanities"
+"group": "mmlu_flan_n_shot_loglikelihood_humanities"
 "include": "_mmlu_flan_loglikelihood_template_yaml"
-"task": "mmlu_flan_n_shot_generative_world_religions"
+"task": "mmlu_flan_n_shot_loglikelihood_world_religions"