Updating the GAE app to work out of the box

[nigeldunn]

I ran into the following issues when I tried to use the GAE part of this repo:

• Module layout for the AppEngine Python SDK has been refactored and module paths are different
• The SSL module is mandatory to get pub/sub working.
• Pub/Sub was returning "One or more messages in the publish request is empty. Each message must contain either non-empty data, or at least one attribute."

These changes make the GAE component work out of the box again albeit with a throw away "test" message.

[googlebot]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for the commit author(s). If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.

[nigeldunn]

I've signed CLA's on 3 different accounts now but I'm still seeing: cla/google — Need a CLA for one or more commit authors

[googlebot]

We found a Contributor License Agreement for you (the sender of this pull request) and all commit authors, but as best as we can tell these commits were authored by someone else. If that's the case, please add them to this pull request and have them confirm that they're okay with these commits being contributed to Google. If we're mistaken and you did author these commits, just reply here to confirm.

[nigeldunn]

I authored the commits.

[tswast]

Thanks. These changes look good to me.

I'll ask one of my teammates to review to make sure the code runs. (I'll have to make sure to add some automated Travis tests for this repo.)

[lesv]

@tswast Can you do this?

[tswast]

Looking now.

[tswast]

Thank you for your contribution!

I verified that these changes fix the App Engine deployment. Merging now.