Add bt clean code and data sets

Code/process_paraphrases.ipynb

data/backtranslations/backtranslations_relocar_temp0.8

data/backtranslations/backtranslations_relocar_temp1.2

data/backtranslations/backtranslations_semeval_loc_temp0.8

data/backtranslations/backtranslations_semeval_loc_temp1.2

data/backtranslations/backtranslations_semeval_org_temp0.8

data/backtranslations/backtranslations_semeval_org_temp1.2

data/fused_datasets/fused_relocar_temp0.8.txt

data/fused_datasets/fused_relocar_temp1.2.txt

data/fused_datasets/fused_semeval_loc_temp0.8.txt

data/fused_datasets/fused_semeval_loc_temp1.2.txt

data/fused_datasets/fused_semeval_org_temp0.8.txt

data/fused_datasets/fused_semeval_org_temp1.2.txt

data/paraphrases/only_paraphrases_relocar_temp0.8.txt

data/paraphrases/only_paraphrases_relocar_temp1.2.txt

data/paraphrases/only_paraphrases_semeval_loc_temp0.8.txt

data/paraphrases/only_paraphrases_semeval_loc_temp1.2.txt

data/paraphrases/only_paraphrases_semeval_org_temp0.8.txt

data/paraphrases/only_paraphrases_semeval_org_temp1.2.txt

data/paraphrases/paraphrases_relocar_temp0.8.csv