updated sentiment analysis function to handle multiple sentences and fix decoding issue

Added MakerShift to community.md

Update community.md

commented reload(sys)

sample-functions/SentimentAnalysis/handler.py

 import sys
+import json
 from textblob import TextBlob
 
+# set default encoding to UTF-8 to eliminate decoding errors
+reload(sys)
+sys.setdefaultencoding('utf8')
+
 def get_stdin():
     buf = ""
     for line in sys.stdin:
         buf = buf + line
-    return buf
+        return buf
 
 if(__name__ == "__main__"):
     st = get_stdin()
     blob = TextBlob(st)
-    out =""
+    res = {
+        "polarity": 0,
+        "subjectivity": 0
+    }
+
     for sentence in blob.sentences:
-        out = out + "Polarity: " + str(sentence.sentiment.polarity) + " Subjectivity: " + str(sentence.sentiment.subjectivity)  + "\n"
-    print(out)
+        res["subjectivity"] = res["subjectivity"] + sentence.sentiment.subjectivity
+        res["polarity"] = res["polarity"] + sentence.sentiment.polarity
+
+    total = len(blob.sentences)
 
+    res["sentence_count"] = total
+    res["polarity"] = res["polarity"] / total
+    res["subjectivity"] = res["subjectivity"] / total
+    print(json.dumps(res))