Automatic server framework

Basically, you can run ```python web/run_tests.py /usr/local/google_appengine web/test``` for the test. (The test cases are not completed, I'll finish it later.)

However, I'm failed to make both front-end and server test run successfully on drone.io...
If I set language as Dart, I can't use many necessary python language. And vice versa.

This is my history of trying: https://drone.io/github.com/roba269/gf2