(tox) Moved everything test-related to tests/
(tox) Added tox.ini and cleaned files

Added tox.ini;
Cleaned unnecessary things and updated paths in files;
Updated .gitignore.
(tox) Some fixes

Added changedir to tox commands and moved the results xml accordingly.
(tox) Made tests work

Added fixtures and templates to MANIFEST.in;
Added SECRET_KEY to settings file.
(tox) Cleaned MANIFEST.in
(tox) Removed --use-mirrors from tox.ini
Integrate origin/tox