(tox) Updated Tox integration

Moved everything test-related to robots/tests/ and updated everything to reflect this;
Updated .gitignore;
Updated tox.ini;
Removed any unnecessary bit of code and made everything consistent to other repo tox integration changes.
(tox) Moved pytest-results.xml to {toxinidir}
(tox) Fixed djrunner xml results filename
(tox) Removed djrunner from tox

Removed djrunner from tox since pytest was already the default test tool for this project and all other packages use only pytest. Also djrunner had a difficulty in finding tests due to the current app folder structure.
Merge branch 'develop' into tox

Conflicts:
	.gitignore
	tox.ini
(tox) Moved test-templates/ to tests/templates/

Moved test templates to tests/ folder and updated related files to reflect this.
Merge branch 'develop' into tox

Conflicts:
	tox.ini
Merge branch 'develop' into tox
(tox) Added more flags to tox.ini
Merge pull request #10 from pbs/tox

Updated Tox integration