BIG Reorganize examples (#4213)

* Created using Colaboratory

* [examples] reorganize files

* remove run_tpu_glue.py as superseded by TPU support in Trainer

* Bugfix: int, not tuple

* move files around

examples/summarization/bart/run_train_tiny.sh

@@ -12,7 +12,7 @@ export OUTPUT_DIR=${CURRENT_DIR}/${OUTPUT_DIR_NAME}
 # Make output directory if it doesn't exist
 mkdir -p $OUTPUT_DIR
 
-# Add parent directory to python path to access transformer_base.py and utils.py
+# Add parent directory to python path to access lightning_base.py and utils.py
 export PYTHONPATH="../../":"${PYTHONPATH}"
 python finetune.py \
 --data_dir=cnn_tiny/ \