adding the achieved percentage of success (gregmalcolm#151)

Author: soejima

python2/runner/sensei.py

@@ -167,10 +167,12 @@ def scrapeInterestingStackDump(self, err):
         return stack_text
 
     def report_progress(self):
-        return "You have completed {0} koans and " \
-            "{1} lessons.".format(
+        return "You have completed {0} ({2} %) koans and " \
+            "{1} (out of {3}) lessons.".format(
                 self.pass_count,
-                self.lesson_pass_count)
+                self.lesson_pass_count,
+                self.pass_count*100/self.total_koans(),
+                self.total_lessons())
 
     def report_remaining(self):
         koans_remaining = self.total_koans() - self.pass_count