Tox configuration to run flake8 (python linter)

Add a few files to use tox (virtualenv wrapper) and setup a flake8 env
to run python linting.

This will let me add a flake8 Jenkins job to the repository.

https://www.mediawiki.org/wiki/Continuous_integration/Tutorials/Test_your_python

Change-Id: Ib2f796c5fbece561411cae6dd37c0b732924d98c
Lint geowiki/mysql_config.py

Merely fixing whitespaces issues (no code change) to match flake8 code
conventions.

Change-Id: I092ef84f847c8876be4a204939b2828d55096a11
Lint geowiki/geo_coding.py

* one import per line
* sort import statements
* explode dicts to have each key,value on its own line.

A few imports are not being used, I left them anyway.  Whitespaces
changes.

Change-Id: Ief085c3c1e001b4919c1a13b431da75a37f13de5
Lint geowiki/process_data.py

* one import per line
* sort import statements
* moved 'sys' import next to where it is being used (in a commented out
  block)
* split a few long docblocks
* whitespace fixes to match pep8 coding style

No code change :-)

Change-Id: Id59d2b3ec580ba97a497f4871b3e4ff28657a5c1
Merge "Lint geowiki/geo_coding.py"
Merge "Lint geowiki/mysql_config.py"