Version 2.1.16

Updates dependent library versions resolving the following security vulnerabilities:

• CVE-2018-14721, CWE-502
• CWE-22
• CVE-2017-12626, CWE-835
• CVE-2018-19360, CWE-502
• CWE-400
• CVE-2018-14719, CWE-502
• CVE-2018-11771, CWE-400
• CVE-2018-10237, CWE-119
• CVE-2015-6748, CWE-79
• CVE-2018-14720, CWE-502
• CVE-2018-14718, CWE-502
• CVE-2018-19361, CWE-502

Updated documentation, general code cleanup.