slow dependency download causes travis deployment to fail

[stephen-soltesz]

The annotation service includes a dependency on google.golang.org/api which must be downloaded twice with the current configuration (once for testing by travis, once for deployment by AppEngine). The total package size is currently around ~719MB (it seems to grow over time). The annotation service has failed four times during the deployment phase while downloading this package.

The mechanism provided by travis to work around slow operations travis_wait is not available during deployment steps.

A third-party package that solves this problem travis-wait-improved provides a tool with the same effect (prevent timeouts) and usable from deployment steps. https://github.com/cisagov/travis-wait-improved

But it does not work, failing with:

Traceback (most recent call last):
  File "/home/travis/.local/bin/travis-wait-improved", line 5, in <module>
    from travis_wait_improved.sherpa import main
  File "/home/travis/.local/lib/python2.7/site-packages/travis_wait_improved/sherpa.py", line 29
SyntaxError: Non-ASCII character '\xe2' in file /home/travis/.local/lib/python2.7/site-packages/travis_wait_improved/sherpa.py on line 29, but no encoding declared; see http://python.org/dev/peps/pep-0263/ for details
Script failed with status 1

[stephen-soltesz]

See this attempted PR: #294