Reduce default stdout verbosity

Add OPENPHOTO_TEST_DEBUG env var for increased debug output
Add run_tests script, to run the test suite will all test servers
Using tox, for the ability to test across multiple Python versions
Use unittest2 where available, to support python <2.7
Correct config test path
Add Python2.6 to tox
Merge pull request #39 from sneakypete81/test_improvements_master

Test improvements