www/rubygem-gollum: Update RUN_DEPENDS
- Change RUN_DEPENDS from rubygem-sinatra to rubygem-sinatra2
- Change RUN_DEPENDS from rubygem-sinatra-contrib to rubygem-sinatra-contrib2
- While I'm here, fix dc4e011ace6acd033db6ecc14ef7d074ad252b7c: for RUN_DEPENDS order
- Bump PORTREVISION for dependency change