new port: textproc/rubygem-wikicloth

Ruby parser for the MediaWiki markup language

WWW: https://github.com/nricciar/wikicloth

PR: 199925
Differential Revision: https://reviews.freebsd.org/D2495
Submitted by: Torsten Zuehlsdorff <ports@toco-domains.de>
Approved by: mat (mentor)