bump(net-misc/gsutil): sync with upstream

Packages updated:
  dev-python/boto
  dev-python/gcs-oauth2-boto-plugin
  dev-python/google-api-python-client
  dev-python/httplib2
  dev-python/python-gflags
  dev-python/retry-decorator
  dev-python/socksipy
  net-misc/gsutil
Merge pull request #138 from marineam/gsutil

bump(net-misc/gsutil): sync with upstream