Checking the existence of ".git" is not the right way to check whether we
are in develop environment because we distribute source tar-balls where
such a ".git" directory does not exist. Replaced it with checking .proto
files.

Fixes #333.

- Comply with flake8, except for indentation width, which is 2.

- Move human-centric metadata to top of 'setup()' call.

- Add Trove classifiers for supported Python versions.

- Use 'find_packages()' + MANIFEST.in to avoid errors in listing
  modules and packages.

Closes #131 and #161.

Use stdlib's 'unittest' instead.

This file was broken in ada65567.

Change-Id: Ief6eccab82712be04285fc918bf0102102bbce21

Change-Id: Ie5114bde3574c6cb0c67d5852b4658287561a0d3

Change-Id: Ifb4958e4f371b36f249faa466473f851697edb5c

Change-Id: I33479e529b060e4fed532a827a386d3baecc835e

Change-Id: I34d301133eea9c6f3a822c47d1f91e136fd33145

Change-Id: Icecb25db34ae5e6d5142a2d75ca7216ba018abb2

  1. Haven't included the include path for "config.h".
  2. Use of C++11 auto keyword.

Temporary change until a py3k-compatible google-apputils is released.