Fixed `setup.py` and `test_settings.py` to run unit tests.
`projects` factory models.
`projects.urls_api` cleaned up.
`TWITTER_HANDLES` added to test settings.
`ProjectList` test case.
`ProjectDetail` view test case.
`ProjectPreviewList` view test case.
Test cases `setUp` methods refactored.
`ProjectPreviewDetail` view test case.
`ProjectTheme` factory model.
`projects.models` general cleaning and PEP8 fixes.
Fixed `ProjectThemeFactory.slug` unique generation.