Add myself (junovitch / Jason Unovitch) to ports committers

• Add authors.ent entry
• Add junovitch@FreeBSD.org to contrib.committers.xml
• Add news item to news.xml
• Add my PGP key
• Fix PGP key sorting while I'm there

Approved by: delphij (mentor)
Differential Revision: https://reviews.FreeBSD.org/D3264