Adding the enhancement feature referring to honeynet#15.

If user only wants textual output as mentioned by So-Cool in enhancement issue honeynet#15.

modules/processing/cuckooml.py

@@ -15,11 +15,18 @@
 from lib.cuckoo.common.constants import CUCKOO_ROOT
 from math import log
 
+if Config("cuckooml").cuckooml.plotting:
+    try:
+        import matplotlib.pyplot as plt
+        import seaborn as sns
+    except ImportError, e:
+        print >> sys.stderr, "Some error while importing plotting libraries" 
+        print >> sys.stderr, e
+
+
 try:
-    import matplotlib.pyplot as plt
     import numpy as np
     import pandas as pd
-    import seaborn as sns
     from hdbscan import HDBSCAN
     from sklearn import metrics
     from sklearn.cluster import DBSCAN