Fixup a comment, suppress logging during tests

- Commit 947470d77112a5ee0ab1a037d77104cdb25c18e5 rendered a comment inaccurate
  in syncserver/__init__.py.

- Logging to stdout by default obscures test results; disable the stdout deluge
  by changing the logging class in syncserver/tests.ini
Remove testing packages from requirements.txt
Subjectively clean up Makefile

I think the following Makefile might be a little more maintainable, grokkable,
and robust.
Don't run tests by default when calling make

Making it explicit via `make test` makes more sense to me.
Merge pull request #15 from mozilla-services/cleanup

Miscellaneous cleanup