Log Message:
py-google-api-python-client: update to 1.7.8.

v1.7.8
  Version 1.7.8

  Bugfix release
  - Convert '$' in method name to '_' \ 
([#616](https://github.com/googleapis/google-api-python-client/pull/616))
  - Alias unitest2 import as unittest in test__auth.py \ 
([#613](https://github.com/googleapis/google-api-python-client/pull/613))

v1.7.7
  Version 1.7.7

    Bugfix release
    - Change xrange to range \ 
([#601](https://github.com/google/google-api-python-client/pull/601))
    - Typo in http.py exception message. \ 
([#602](https://github.com/google/google-api-python-client/pull/602))

    - Announce deprecation of Python 2.7 \ 
([#603](https://github.com/google/google-api-python-client/pull/603))
    - Updates documentation for stopping channel subscriptions \ 
([#598](https://github.com/google/google-api-python-client/pull/598))
    - Adding example for searchAppearance \ 
([#414](https://github.com/google/google-api-python-client/pull/414))

    - Add badges \ 
([#455](https://github.com/google/google-api-python-client/pull/455))