modified grade.py to work with new xserver

grade.py

@@ -19,7 +19,7 @@ from essay_set import EssaySet
 import feature_extractor
 import sklearn.ensemble
 
-def grade(grader_path,submission):
+def grade(grader_path,submission,sandbox):
     results = {'errors': [],'tests': [],'correct': False,'score': 0}
 
     #Try to find and load the model file

tests/tmpfile

- in order to replicate this experiment , we would need to know the temperature of the vinegar as well as how much vinegar to put in . both of these could vary and therefore change the result of the experiment . 
\ No newline at end of file
+ in order to replicate the experiment .you would need to know how much vinegar to pour ,you need to know how much distilled water and you aso need to know how your going to weigh it . 
\ No newline at end of file

util_functions.py

@@ -19,7 +19,7 @@ def sub_chars(string):
     Removes all non-punctuation, digit, or letter characters.
     Returns sanitized string.
     """
-    sub_pat = r"[^A-Za-z\.\?!,;:']"
+    sub_pat = r"[^A-Za-z\.\?!,]"
     char_pat = r"\."
     com_pat = r","
     ques_pat = r"\?"