UCenter python implement with python.

Usage:

first, put your ucenter settings in ucenter.base.Config, and define uc_* calls in uc_client.yaml, alternatively, you can refine the ucenter.client.generate_interfaces to use your own uc_* call difinations.

import ucenter

# call ucenter
client = ucenter.Client(request.header['User-Agent'])
ret = client.uc_user_register(**kw)
# use ret for your stuff

# for ucenter callback url, just use UcenterAPI:
class MyUcenterAPI(ucenter.UcenterAPI):
  def do_user_synlogin(self):
    # local login stuff
    return self.API_RETURN_SUCCEED

KNOWN ISSUE: some pm_* api in ucenter not work, I don't know if it's my ucenter version error...
TODO: need some test cases.