Enabled auto reloading of source files in backend.

src/backend/backend.py

@@ -12,8 +12,6 @@ urls = (
     '/math\.py/answer', 'Answer',
 )
 
-app = web.application(urls, globals())
-
 
 def get_last_line():
     data = web.input(data='').data
@@ -136,4 +134,5 @@ class validate(object):
 
 
 if __name__ == "__main__":
+    app = web.application(urls, globals(), autoreload=True)
     app.run()