* Move tests to tests/ directory
* Remove unused `tox.ini` file
* Add flake8 compliance
* Add `lint` target to `tests` target in the Makefile

* D-Link DGS-1510 - Multiple Vulnerabilities. GitHub Issue #219.

* Changes per PR comments.

* Removed redundant code in test file.

* Dlink DGS 1510 add user exploit

* Add ability to cast Option's value to integer

* Fix formatting.

Covering validators.ipv4 with tests.