* initialize an autoloader and use it from responder.php and from unit tests
* file auditing should check that every file in src/engine/ has a
  corresponding test file; create some stub test files so this passes
Merge pull request #50 from cgolubi1/infrastructure

autoloading!  finally!
- Set up test database connection
- Added option to specify that BMInterface uses the test database connection
- Added empty unit test for create_game() and load_game()