added new csv mixin for writing a set of lines to a file.

artifice/csv_mixin.py

@@ -0,0 +1,19 @@
+from csv import writer
+
+
+class CSV_File_mixin(object):
+
+    def write_output(self):
+        try:
+            read = open(self.filename)
+            raise RuntimeError("Can't write to an existing file!")
+        except IOError:
+            pass
+        fh = open(self.filename, "w")
+
+        csvwriter = writer(fh, dialect='excel', delimiter=',')
+        for line in self.lines:
+            # Line is expected to be an iterable row
+            csvwriter.writerow(line)
+
+        fh.close()