Integrated with Coverity Scan for build analysis notifications.

See: https://scan.coverity.com/travis_ci
See: https://scan.coverity.com/projects/3233
Imported a public-domain UTF-8 encoder from the librfc project.

See: https://github.com/dryproject/librfc/tree/master/src/rfc/rfc3629/
Ensured that the UTF-8 encoder header file is correctly included.