Adds problems and result saving

copycat/__init__.py

@@ -1,2 +1,3 @@
 from .copycat import Copycat, Reporter  # noqa
 from .plot    import plot_answers
+from .io      import save_answers

copycat/io.py

@@ -0,0 +1,9 @@
+
+def save_answers(answers, filename):
+    answers = sorted(answers.items(), key=lambda kv : kv[1]['count'])
+    keys    = [k for k, v in answers]
+    counts  = [str(v['count']) for k, v in answers]
+    with open(filename, 'w') as outfile:
+        outfile.write(','.join(keys))
+        outfile.write('\n')
+        outfile.write(','.join(counts))