Security/Guidelines/input validation

Relevant resources on Input validation and output initialization and related links:

- https://www.owasp.org/index.php/Top_10_2013-A1-Injection

- https://www.owasp.org/index.php/Data_Validation/

- https://www.owasp.org/index.php/Cross-site_Scripting_(XSS)

- https://www.owasp.org/index.php/XSS_(Cross_Site_Scripting)_Prevention_Cheat_Sheet

- https://www.owasp.org/index.php/Testing_for_XML_Injection_(OWASP-DV-008)

- https://www.owasp.org/index.php/XPATH_Injection

- https://www.owasp.org/index.php/OWASP_AJAX_Security_Guidelines

- https://www.owasp.org/index.php/SQL_Injection

- https://docs.djangoproject.com/en/dev/topics/security/