add data senseval2 and update code with fixes for senseval2 on line 46

Senseval_Prep/EnglishAW.test.key

Senseval_Prep/Senseval2/d00.pkl

Senseval_Prep/Senseval2/d00_sent.pkl

Senseval_Prep/Senseval2/d01.pkl

Senseval_Prep/Senseval2/d01_sent.pkl

Senseval_Prep/Senseval2/d02.pkl

Senseval_Prep/Senseval2/d02_sent.pkl

Senseval_Prep/Senseval2/eng-all-words_seneval2.test.xml

Senseval_Prep/Senseval2/wsj_0089.mrg

Senseval_Prep/Senseval2/wsj_0465.mrg

Senseval_Prep/Senseval2/wsj_1286.mrg

Senseval_Prep/key_senseval2

Senseval_Prep/senseval_prep.py

Senseval_Prep/senseval_preprocessing.py