Since there is no demo or us site anymore we can simplify the structure
somewhat by moving the sandbox one directory up

oscar_vagrant was confusing.

c06e1df wrongly changed the imports to relative imports, as settings
isn't a module (but probably should be). Reverting those changes for
now.

python-modernize (https://github.com/mitsuhiko/python-modernize) is a
useful wrapper around 2to3 which comes with sane defaults.

The fixes below were generated by running

    python-modernize --compat-unicode -w .

and then fixing all lint errors.

* Use correct username for MySQL on Travis
  Travis docs say username should be 'travis', not 'root'.

* Fail test_migrations.sh if any command fails
  Previously, a failing (non-zero exit code) command would not lead to
  a non-zero exit code of test_migrations.sh. That meant that failing
  migrations would not fail the Travis job as intended.

* Remove accidentally commmitted module code
* Adjust gitignore files
* Add MakeFile target for pulling down puppet modules
* Add settings file for MySQL/Postgres